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Finding the Fourth Proportional to 86.18, 118.95 and 79.52

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Solution

The fourth proportional to 86.18, 118.95 and 79.52 is: 109.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.18 : 118.95 = 79.52 : x
  2. Step 2: Convert to fraction form
    86.18/118.95 = 79.52/x
  3. Step 3: Cross multiply
    86.18x = 118.95 × 79.52
  4. Step 4: Simplify right side
    86.18x = 9,458.90
  5. Step 5: Solve for x
    x = 9,458.90/86.18
  6. Step 6: Final answer
    x = 109.76

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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.