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Finding the Fourth Proportional to 118.18, 177.01 and 72.39

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Solution

The fourth proportional to 118.18, 177.01 and 72.39 is: 108.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.18 : 177.01 = 72.39 : x
  2. Step 2: Convert to fraction form
    118.18/177.01 = 72.39/x
  3. Step 3: Cross multiply
    118.18x = 177.01 × 72.39
  4. Step 4: Simplify right side
    118.18x = 12,813.57
  5. Step 5: Solve for x
    x = 12,813.57/118.18
  6. Step 6: Final answer
    x = 108.42

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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.