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Finding the Fourth Proportional to 38,751.53, 58,129.11 and 13,791.78

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Solution

The fourth proportional to 38,751.53, 58,129.11 and 13,791.78 is: 20,688.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,751.53 : 58,129.11 = 13,791.78 : x
  2. Step 2: Convert to fraction form
    38,751.53/58,129.11 = 13,791.78/x
  3. Step 3: Cross multiply
    38,751.53x = 58,129.11 × 13,791.78
  4. Step 4: Simplify right side
    38,751.53x = 801,703,896.72
  5. Step 5: Solve for x
    x = 801,703,896.72/38,751.53
  6. Step 6: Final answer
    x = 20,688.32

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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.