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Finding the Fourth Proportional to 87.63, 120.90 and 59.97

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Solution

The fourth proportional to 87.63, 120.90 and 59.97 is: 82.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.63 : 120.90 = 59.97 : x
  2. Step 2: Convert to fraction form
    87.63/120.90 = 59.97/x
  3. Step 3: Cross multiply
    87.63x = 120.90 × 59.97
  4. Step 4: Simplify right side
    87.63x = 7,250.37
  5. Step 5: Solve for x
    x = 7,250.37/87.63
  6. Step 6: Final answer
    x = 82.74

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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.