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Finding the Fourth Proportional to 125,565.30, 188,288.55 and 72,990.90

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Solution

The fourth proportional to 125,565.30, 188,288.55 and 72,990.90 is: 109,451.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,565.30 : 188,288.55 = 72,990.90 : x
  2. Step 2: Convert to fraction form
    125,565.30/188,288.55 = 72,990.90/x
  3. Step 3: Cross multiply
    125,565.30x = 188,288.55 × 72,990.90
  4. Step 4: Simplify right side
    125,565.30x = 13,743,350,724.20
  5. Step 5: Solve for x
    x = 13,743,350,724.20/125,565.30
  6. Step 6: Final answer
    x = 109,451.82

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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.