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Finding the Fourth Proportional to 87.75, 121.08 and 69.37

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Solution

The fourth proportional to 87.75, 121.08 and 69.37 is: 95.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.75 : 121.08 = 69.37 : x
  2. Step 2: Convert to fraction form
    87.75/121.08 = 69.37/x
  3. Step 3: Cross multiply
    87.75x = 121.08 × 69.37
  4. Step 4: Simplify right side
    87.75x = 8,399.32
  5. Step 5: Solve for x
    x = 8,399.32/87.75
  6. Step 6: Final answer
    x = 95.72

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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.