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Finding the Fourth Proportional to 57,765.91, 79,687.92 and 39,870.85

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Solution

The fourth proportional to 57,765.91, 79,687.92 and 39,870.85 is: 55,001.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,765.91 : 79,687.92 = 39,870.85 : x
  2. Step 2: Convert to fraction form
    57,765.91/79,687.92 = 39,870.85/x
  3. Step 3: Cross multiply
    57,765.91x = 79,687.92 × 39,870.85
  4. Step 4: Simplify right side
    57,765.91x = 3,177,225,105.13
  5. Step 5: Solve for x
    x = 3,177,225,105.13/57,765.91
  6. Step 6: Final answer
    x = 55,001.73

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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.