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Finding the Fourth Proportional to 87.55, 120.81 and 50.71

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Solution

The fourth proportional to 87.55, 120.81 and 50.71 is: 69.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.55 : 120.81 = 50.71 : x
  2. Step 2: Convert to fraction form
    87.55/120.81 = 50.71/x
  3. Step 3: Cross multiply
    87.55x = 120.81 × 50.71
  4. Step 4: Simplify right side
    87.55x = 6,126.28
  5. Step 5: Solve for x
    x = 6,126.28/87.55
  6. Step 6: Final answer
    x = 69.98

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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.