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Finding the Fourth Proportional to 721,002.13, 994,989.41 and 398,734

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Solution

The fourth proportional to 721,002.13, 994,989.41 and 398,734 is: 550,256.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,002.13 : 994,989.41 = 398,734 : x
  2. Step 2: Convert to fraction form
    721,002.13/994,989.41 = 398,734/x
  3. Step 3: Cross multiply
    721,002.13x = 994,989.41 × 398,734
  4. Step 4: Simplify right side
    721,002.13x = 396,736,107,406.94
  5. Step 5: Solve for x
    x = 396,736,107,406.94/721,002.13
  6. Step 6: Final answer
    x = 550,256.50

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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.