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Finding the Fourth Proportional to 118.55, 177.85 and 67.21

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Solution

The fourth proportional to 118.55, 177.85 and 67.21 is: 100.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.55 : 177.85 = 67.21 : x
  2. Step 2: Convert to fraction form
    118.55/177.85 = 67.21/x
  3. Step 3: Cross multiply
    118.55x = 177.85 × 67.21
  4. Step 4: Simplify right side
    118.55x = 11,953.41
  5. Step 5: Solve for x
    x = 11,953.41/118.55
  6. Step 6: Final answer
    x = 100.83

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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.