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Finding the Fourth Proportional to 87.28, 120.55 and 59.60

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Solution

The fourth proportional to 87.28, 120.55 and 59.60 is: 82.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.28 : 120.55 = 59.60 : x
  2. Step 2: Convert to fraction form
    87.28/120.55 = 59.60/x
  3. Step 3: Cross multiply
    87.28x = 120.55 × 59.60
  4. Step 4: Simplify right side
    87.28x = 7,184.78
  5. Step 5: Solve for x
    x = 7,184.78/87.28
  6. Step 6: Final answer
    x = 82.32

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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.