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Finding the Fourth Proportional to 67.19, 100.40 and 54.18

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Solution

The fourth proportional to 67.19, 100.40 and 54.18 is: 80.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.19 : 100.40 = 54.18 : x
  2. Step 2: Convert to fraction form
    67.19/100.40 = 54.18/x
  3. Step 3: Cross multiply
    67.19x = 100.40 × 54.18
  4. Step 4: Simplify right side
    67.19x = 5,439.40
  5. Step 5: Solve for x
    x = 5,439.40/67.19
  6. Step 6: Final answer
    x = 80.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.