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Finding the Fourth Proportional to 718,296.76, 991,294.20 and 396,006.37

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Solution

The fourth proportional to 718,296.76, 991,294.20 and 396,006.37 is: 546,513.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,296.76 : 991,294.20 = 396,006.37 : x
  2. Step 2: Convert to fraction form
    718,296.76/991,294.20 = 396,006.37/x
  3. Step 3: Cross multiply
    718,296.76x = 991,294.20 × 396,006.37
  4. Step 4: Simplify right side
    718,296.76x = 392,558,815,265.82
  5. Step 5: Solve for x
    x = 392,558,815,265.82/718,296.76
  6. Step 6: Final answer
    x = 546,513.41

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Double scale
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1.5x scale

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.