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Finding the Fourth Proportional to 118.35, 177.84 and 72.81

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Solution

The fourth proportional to 118.35, 177.84 and 72.81 is: 109.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.35 : 177.84 = 72.81 : x
  2. Step 2: Convert to fraction form
    118.35/177.84 = 72.81/x
  3. Step 3: Cross multiply
    118.35x = 177.84 × 72.81
  4. Step 4: Simplify right side
    118.35x = 12,948.53
  5. Step 5: Solve for x
    x = 12,948.53/118.35
  6. Step 6: Final answer
    x = 109.41

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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.