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Finding the Fourth Proportional to 79.32, 118.86 and 67.86

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Solution

The fourth proportional to 79.32, 118.86 and 67.86 is: 101.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.32 : 118.86 = 67.86 : x
  2. Step 2: Convert to fraction form
    79.32/118.86 = 67.86/x
  3. Step 3: Cross multiply
    79.32x = 118.86 × 67.86
  4. Step 4: Simplify right side
    79.32x = 8,065.84
  5. Step 5: Solve for x
    x = 8,065.84/79.32
  6. Step 6: Final answer
    x = 101.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.