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Finding the Fourth Proportional to 720,743.39, 994,575.92 and 398,428.11

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Solution

The fourth proportional to 720,743.39, 994,575.92 and 398,428.11 is: 549,803.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,743.39 : 994,575.92 = 398,428.11 : x
  2. Step 2: Convert to fraction form
    720,743.39/994,575.92 = 398,428.11/x
  3. Step 3: Cross multiply
    720,743.39x = 994,575.92 × 398,428.11
  4. Step 4: Simplify right side
    720,743.39x = 396,267,004,057.11
  5. Step 5: Solve for x
    x = 396,267,004,057.11/720,743.39
  6. Step 6: Final answer
    x = 549,803.18

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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.