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Finding the Fourth Proportional to 87.76, 121.09 and 55.02

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Solution

The fourth proportional to 87.76, 121.09 and 55.02 is: 75.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.76 : 121.09 = 55.02 : x
  2. Step 2: Convert to fraction form
    87.76/121.09 = 55.02/x
  3. Step 3: Cross multiply
    87.76x = 121.09 × 55.02
  4. Step 4: Simplify right side
    87.76x = 6,662.37
  5. Step 5: Solve for x
    x = 6,662.37/87.76
  6. Step 6: Final answer
    x = 75.92

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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.