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Finding the Fourth Proportional to 118.58, 177.53 and 72.79

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Solution

The fourth proportional to 118.58, 177.53 and 72.79 is: 108.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.58 : 177.53 = 72.79 : x
  2. Step 2: Convert to fraction form
    118.58/177.53 = 72.79/x
  3. Step 3: Cross multiply
    118.58x = 177.53 × 72.79
  4. Step 4: Simplify right side
    118.58x = 12,922.10
  5. Step 5: Solve for x
    x = 12,922.10/118.58
  6. Step 6: Final answer
    x = 108.97

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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.