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Finding the Fourth Proportional to 124,915.97, 172,379.75 and 71,218.28

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Solution

The fourth proportional to 124,915.97, 172,379.75 and 71,218.28 is: 98,278.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,915.97 : 172,379.75 = 71,218.28 : x
  2. Step 2: Convert to fraction form
    124,915.97/172,379.75 = 71,218.28/x
  3. Step 3: Cross multiply
    124,915.97x = 172,379.75 × 71,218.28
  4. Step 4: Simplify right side
    124,915.97x = 12,276,589,376.69
  5. Step 5: Solve for x
    x = 12,276,589,376.69/124,915.97
  6. Step 6: Final answer
    x = 98,278.78

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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.