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Finding the Fourth Proportional to 79.42, 109.41 and 67.18

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Solution

The fourth proportional to 79.42, 109.41 and 67.18 is: 92.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.42 : 109.41 = 67.18 : x
  2. Step 2: Convert to fraction form
    79.42/109.41 = 67.18/x
  3. Step 3: Cross multiply
    79.42x = 109.41 × 67.18
  4. Step 4: Simplify right side
    79.42x = 7,350.16
  5. Step 5: Solve for x
    x = 7,350.16/79.42
  6. Step 6: Final answer
    x = 92.55

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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.