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Finding the Fourth Proportional to 118.24, 177.42 and 66.91

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Solution

The fourth proportional to 118.24, 177.42 and 66.91 is: 100.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.24 : 177.42 = 66.91 : x
  2. Step 2: Convert to fraction form
    118.24/177.42 = 66.91/x
  3. Step 3: Cross multiply
    118.24x = 177.42 × 66.91
  4. Step 4: Simplify right side
    118.24x = 11,871.17
  5. Step 5: Solve for x
    x = 11,871.17/118.24
  6. Step 6: Final answer
    x = 100.40

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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.