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Finding the Fourth Proportional to 398,396.22, 597,711.12 and 128,518.95

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Solution

The fourth proportional to 398,396.22, 597,711.12 and 128,518.95 is: 192,816.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,396.22 : 597,711.12 = 128,518.95 : x
  2. Step 2: Convert to fraction form
    398,396.22/597,711.12 = 128,518.95/x
  3. Step 3: Cross multiply
    398,396.22x = 597,711.12 × 128,518.95
  4. Step 4: Simplify right side
    398,396.22x = 76,817,205,545.72
  5. Step 5: Solve for x
    x = 76,817,205,545.72/398,396.22
  6. Step 6: Final answer
    x = 192,816.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.