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Finding the Fourth Proportional to 1,679,985.60, 2,519,978.40 and 1,008,139.20

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Solution

The fourth proportional to 1,679,985.60, 2,519,978.40 and 1,008,139.20 is: 1,512,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679,985.60 : 2,519,978.40 = 1,008,139.20 : x
  2. Step 2: Convert to fraction form
    1,679,985.60/2,519,978.40 = 1,008,139.20/x
  3. Step 3: Cross multiply
    1,679,985.60x = 2,519,978.40 × 1,008,139.20
  4. Step 4: Simplify right side
    1,679,985.60x = 2,540,489,008,193.28
  5. Step 5: Solve for x
    x = 2,540,489,008,193.28/1,679,985.60
  6. Step 6: Final answer
    x = 1,512,208.80

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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.