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Finding the Fourth Proportional to 718,139.43, 991,032.17 and 395,854.91

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Solution

The fourth proportional to 718,139.43, 991,032.17 and 395,854.91 is: 546,279.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,139.43 : 991,032.17 = 395,854.91 : x
  2. Step 2: Convert to fraction form
    718,139.43/991,032.17 = 395,854.91/x
  3. Step 3: Cross multiply
    718,139.43x = 991,032.17 × 395,854.91
  4. Step 4: Simplify right side
    718,139.43x = 392,304,943,528.02
  5. Step 5: Solve for x
    x = 392,304,943,528.02/718,139.43
  6. Step 6: Final answer
    x = 546,279.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.