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Finding the Fourth Proportional to 639,895,985.60, 959,843,978.40 and 446,026,308.80

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Solution

The fourth proportional to 639,895,985.60, 959,843,978.40 and 446,026,308.80 is: 669,039,463.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,895,985.60 : 959,843,978.40 = 446,026,308.80 : x
  2. Step 2: Convert to fraction form
    639,895,985.60/959,843,978.40 = 446,026,308.80/x
  3. Step 3: Cross multiply
    639,895,985.60x = 959,843,978.40 × 446,026,308.80
  4. Step 4: Simplify right side
    639,895,985.60x = 428,115,666,709,658,944
  5. Step 5: Solve for x
    x = 428,115,666,709,658,944/639,895,985.60
  6. Step 6: Final answer
    x = 669,039,463.20

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.