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Finding the Fourth Proportional to 118.28, 177.20 and 87.76

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Solution

The fourth proportional to 118.28, 177.20 and 87.76 is: 131.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.28 : 177.20 = 87.76 : x
  2. Step 2: Convert to fraction form
    118.28/177.20 = 87.76/x
  3. Step 3: Cross multiply
    118.28x = 177.20 × 87.76
  4. Step 4: Simplify right side
    118.28x = 15,551.07
  5. Step 5: Solve for x
    x = 15,551.07/118.28
  6. Step 6: Final answer
    x = 131.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.