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Finding the Fourth Proportional to 639,979.60, 959,969.40 and 630,648.40

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Solution

The fourth proportional to 639,979.60, 959,969.40 and 630,648.40 is: 945,972.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,979.60 : 959,969.40 = 630,648.40 : x
  2. Step 2: Convert to fraction form
    639,979.60/959,969.40 = 630,648.40/x
  3. Step 3: Cross multiply
    639,979.60x = 959,969.40 × 630,648.40
  4. Step 4: Simplify right side
    639,979.60x = 605,403,166,158.96
  5. Step 5: Solve for x
    x = 605,403,166,158.96/639,979.60
  6. Step 6: Final answer
    x = 945,972.60

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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.