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Finding the Fourth Proportional to 81,689.78, 122,552.50 and 25,534.10

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Solution

The fourth proportional to 81,689.78, 122,552.50 and 25,534.10 is: 38,306.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,689.78 : 122,552.50 = 25,534.10 : x
  2. Step 2: Convert to fraction form
    81,689.78/122,552.50 = 25,534.10/x
  3. Step 3: Cross multiply
    81,689.78x = 122,552.50 × 25,534.10
  4. Step 4: Simplify right side
    81,689.78x = 3,129,267,790.25
  5. Step 5: Solve for x
    x = 3,129,267,790.25/81,689.78
  6. Step 6: Final answer
    x = 38,306.72

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1.5x scale

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.