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Finding the Fourth Proportional to 79.38, 118.33 and 79.11

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Solution

The fourth proportional to 79.38, 118.33 and 79.11 is: 117.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.38 : 118.33 = 79.11 : x
  2. Step 2: Convert to fraction form
    79.38/118.33 = 79.11/x
  3. Step 3: Cross multiply
    79.38x = 118.33 × 79.11
  4. Step 4: Simplify right side
    79.38x = 9,360.89
  5. Step 5: Solve for x
    x = 9,360.89/79.38
  6. Step 6: Final answer
    x = 117.93

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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.