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Finding the Fourth Proportional to 118.41, 177.49 and 90.91

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Solution

The fourth proportional to 118.41, 177.49 and 90.91 is: 136.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.41 : 177.49 = 90.91 : x
  2. Step 2: Convert to fraction form
    118.41/177.49 = 90.91/x
  3. Step 3: Cross multiply
    118.41x = 177.49 × 90.91
  4. Step 4: Simplify right side
    118.41x = 16,135.95
  5. Step 5: Solve for x
    x = 16,135.95/118.41
  6. Step 6: Final answer
    x = 136.28

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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.