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Finding the Fourth Proportional to 720,716.52, 994,512.69 and 398,374.59

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Solution

The fourth proportional to 720,716.52, 994,512.69 and 398,374.59 is: 549,714.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,716.52 : 994,512.69 = 398,374.59 : x
  2. Step 2: Convert to fraction form
    720,716.52/994,512.69 = 398,374.59/x
  3. Step 3: Cross multiply
    720,716.52x = 994,512.69 × 398,374.59
  4. Step 4: Simplify right side
    720,716.52x = 396,188,585,128.55
  5. Step 5: Solve for x
    x = 396,188,585,128.55/720,716.52
  6. Step 6: Final answer
    x = 549,714.87

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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.