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Finding the Fourth Proportional to 118.38, 177.55 and 40.28

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Solution

The fourth proportional to 118.38, 177.55 and 40.28 is: 60.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.38 : 177.55 = 40.28 : x
  2. Step 2: Convert to fraction form
    118.38/177.55 = 40.28/x
  3. Step 3: Cross multiply
    118.38x = 177.55 × 40.28
  4. Step 4: Simplify right side
    118.38x = 7,151.95
  5. Step 5: Solve for x
    x = 7,151.95/118.38
  6. Step 6: Final answer
    x = 60.42

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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.