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Finding the Fourth Proportional to 87.49, 120.65 and 59.80

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Solution

The fourth proportional to 87.49, 120.65 and 59.80 is: 82.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.49 : 120.65 = 59.80 : x
  2. Step 2: Convert to fraction form
    87.49/120.65 = 59.80/x
  3. Step 3: Cross multiply
    87.49x = 120.65 × 59.80
  4. Step 4: Simplify right side
    87.49x = 7,214.87
  5. Step 5: Solve for x
    x = 7,214.87/87.49
  6. Step 6: Final answer
    x = 82.47

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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.