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Finding the Fourth Proportional to 81,149.78, 121,720.12 and 21,981.11

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Solution

The fourth proportional to 81,149.78, 121,720.12 and 21,981.11 is: 32,970.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,149.78 : 121,720.12 = 21,981.11 : x
  2. Step 2: Convert to fraction form
    81,149.78/121,720.12 = 21,981.11/x
  3. Step 3: Cross multiply
    81,149.78x = 121,720.12 × 21,981.11
  4. Step 4: Simplify right side
    81,149.78x = 2,675,542,683.38
  5. Step 5: Solve for x
    x = 2,675,542,683.38/81,149.78
  6. Step 6: Final answer
    x = 32,970.42

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Similar ratio
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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.