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Finding the Fourth Proportional to 718,436.08, 991,422.72 and 396,140.72

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Solution

The fourth proportional to 718,436.08, 991,422.72 and 396,140.72 is: 546,663.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,436.08 : 991,422.72 = 396,140.72 : x
  2. Step 2: Convert to fraction form
    718,436.08/991,422.72 = 396,140.72/x
  3. Step 3: Cross multiply
    718,436.08x = 991,422.72 × 396,140.72
  4. Step 4: Simplify right side
    718,436.08x = 392,742,910,125.16
  5. Step 5: Solve for x
    x = 392,742,910,125.16/718,436.08
  6. Step 6: Final answer
    x = 546,663.68

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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.