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Finding the Fourth Proportional to 79.18, 108.55 and 77.92

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Solution

The fourth proportional to 79.18, 108.55 and 77.92 is: 106.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.18 : 108.55 = 77.92 : x
  2. Step 2: Convert to fraction form
    79.18/108.55 = 77.92/x
  3. Step 3: Cross multiply
    79.18x = 108.55 × 77.92
  4. Step 4: Simplify right side
    79.18x = 8,458.22
  5. Step 5: Solve for x
    x = 8,458.22/79.18
  6. Step 6: Final answer
    x = 106.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.