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Finding the Fourth Proportional to 87.45, 131.27 and 74.08

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Solution

The fourth proportional to 87.45, 131.27 and 74.08 is: 111.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.45 : 131.27 = 74.08 : x
  2. Step 2: Convert to fraction form
    87.45/131.27 = 74.08/x
  3. Step 3: Cross multiply
    87.45x = 131.27 × 74.08
  4. Step 4: Simplify right side
    87.45x = 9,724.48
  5. Step 5: Solve for x
    x = 9,724.48/87.45
  6. Step 6: Final answer
    x = 111.20

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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.