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Finding the Fourth Proportional to 118.86, 177.42 and 115.38

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Solution

The fourth proportional to 118.86, 177.42 and 115.38 is: 172.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.86 : 177.42 = 115.38 : x
  2. Step 2: Convert to fraction form
    118.86/177.42 = 115.38/x
  3. Step 3: Cross multiply
    118.86x = 177.42 × 115.38
  4. Step 4: Simplify right side
    118.86x = 20,470.72
  5. Step 5: Solve for x
    x = 20,470.72/118.86
  6. Step 6: Final answer
    x = 172.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.