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Finding the Fourth Proportional to 718,399.13, 991,379.86 and 396,100.94

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Solution

The fourth proportional to 718,399.13, 991,379.86 and 396,100.94 is: 546,613.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,399.13 : 991,379.86 = 396,100.94 : x
  2. Step 2: Convert to fraction form
    718,399.13/991,379.86 = 396,100.94/x
  3. Step 3: Cross multiply
    718,399.13x = 991,379.86 × 396,100.94
  4. Step 4: Simplify right side
    718,399.13x = 392,686,488,495.92
  5. Step 5: Solve for x
    x = 392,686,488,495.92/718,399.13
  6. Step 6: Final answer
    x = 546,613.26

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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.