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Finding the Fourth Proportional to 118.38, 163.12 and 79.00

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Solution

The fourth proportional to 118.38, 163.12 and 79.00 is: 108.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.38 : 163.12 = 79.00 : x
  2. Step 2: Convert to fraction form
    118.38/163.12 = 79.00/x
  3. Step 3: Cross multiply
    118.38x = 163.12 × 79.00
  4. Step 4: Simplify right side
    118.38x = 12,885.27
  5. Step 5: Solve for x
    x = 12,885.27/118.38
  6. Step 6: Final answer
    x = 108.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.