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Finding the Fourth Proportional to 79.47, 118.71 and 72.65

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Solution

The fourth proportional to 79.47, 118.71 and 72.65 is: 108.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.47 : 118.71 = 72.65 : x
  2. Step 2: Convert to fraction form
    79.47/118.71 = 72.65/x
  3. Step 3: Cross multiply
    79.47x = 118.71 × 72.65
  4. Step 4: Simplify right side
    79.47x = 8,624.58
  5. Step 5: Solve for x
    x = 8,624.58/79.47
  6. Step 6: Final answer
    x = 108.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.