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Finding the Fourth Proportional to 81,151.40, 121,727.10 and 25,747.40

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Solution

The fourth proportional to 81,151.40, 121,727.10 and 25,747.40 is: 38,621.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,151.40 : 121,727.10 = 25,747.40 : x
  2. Step 2: Convert to fraction form
    81,151.40/121,727.10 = 25,747.40/x
  3. Step 3: Cross multiply
    81,151.40x = 121,727.10 × 25,747.40
  4. Step 4: Simplify right side
    81,151.40x = 3,134,156,334.54
  5. Step 5: Solve for x
    x = 3,134,156,334.54/81,151.40
  6. Step 6: Final answer
    x = 38,621.10

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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.