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Finding the Fourth Proportional to 72,125.43, 99,531.12 and 39,418.53

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Solution

The fourth proportional to 72,125.43, 99,531.12 and 39,418.53 is: 54,396.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,125.43 : 99,531.12 = 39,418.53 : x
  2. Step 2: Convert to fraction form
    72,125.43/99,531.12 = 39,418.53/x
  3. Step 3: Cross multiply
    72,125.43x = 99,531.12 × 39,418.53
  4. Step 4: Simplify right side
    72,125.43x = 3,923,370,439.65
  5. Step 5: Solve for x
    x = 3,923,370,439.65/72,125.43
  6. Step 6: Final answer
    x = 54,396.49

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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.