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Finding the Fourth Proportional to 720,614.61, 994,437.36 and 398,317.59

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Solution

The fourth proportional to 720,614.61, 994,437.36 and 398,317.59 is: 549,672.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,614.61 : 994,437.36 = 398,317.59 : x
  2. Step 2: Convert to fraction form
    720,614.61/994,437.36 = 398,317.59/x
  3. Step 3: Cross multiply
    720,614.61x = 994,437.36 × 398,317.59
  4. Step 4: Simplify right side
    720,614.61x = 396,101,892,641.16
  5. Step 5: Solve for x
    x = 396,101,892,641.16/720,614.61
  6. Step 6: Final answer
    x = 549,672.30

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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.