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Finding the Fourth Proportional to 718,705.96, 991,818.90 and 396,424.76

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Solution

The fourth proportional to 718,705.96, 991,818.90 and 396,424.76 is: 547,068.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,705.96 : 991,818.90 = 396,424.76 : x
  2. Step 2: Convert to fraction form
    718,705.96/991,818.90 = 396,424.76/x
  3. Step 3: Cross multiply
    718,705.96x = 991,818.90 × 396,424.76
  4. Step 4: Simplify right side
    718,705.96x = 393,181,569,395.96
  5. Step 5: Solve for x
    x = 393,181,569,395.96/718,705.96
  6. Step 6: Final answer
    x = 547,068.75

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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.