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Finding the Fourth Proportional to 718,139.18, 991,031.82 and 395,854.66

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Solution

The fourth proportional to 718,139.18, 991,031.82 and 395,854.66 is: 546,279.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,139.18 : 991,031.82 = 395,854.66 : x
  2. Step 2: Convert to fraction form
    718,139.18/991,031.82 = 395,854.66/x
  3. Step 3: Cross multiply
    718,139.18x = 991,031.82 × 395,854.66
  4. Step 4: Simplify right side
    718,139.18x = 392,304,559,200.12
  5. Step 5: Solve for x
    x = 392,304,559,200.12/718,139.18
  6. Step 6: Final answer
    x = 546,279.29

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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.