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Finding the Fourth Proportional to 125,318.83, 172,912.89 and 79,391.83

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Solution

The fourth proportional to 125,318.83, 172,912.89 and 79,391.83 is: 109,543.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,318.83 : 172,912.89 = 79,391.83 : x
  2. Step 2: Convert to fraction form
    125,318.83/172,912.89 = 79,391.83/x
  3. Step 3: Cross multiply
    125,318.83x = 172,912.89 × 79,391.83
  4. Step 4: Simplify right side
    125,318.83x = 13,727,870,767.69
  5. Step 5: Solve for x
    x = 13,727,870,767.69/125,318.83
  6. Step 6: Final answer
    x = 109,543.56

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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.