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Finding the Fourth Proportional to 79.76, 118.70 and 79.13

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Solution

The fourth proportional to 79.76, 118.70 and 79.13 is: 117.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.76 : 118.70 = 79.13 : x
  2. Step 2: Convert to fraction form
    79.76/118.70 = 79.13/x
  3. Step 3: Cross multiply
    79.76x = 118.70 × 79.13
  4. Step 4: Simplify right side
    79.76x = 9,391.74
  5. Step 5: Solve for x
    x = 9,391.74/79.76
  6. Step 6: Final answer
    x = 117.76

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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.