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Finding the Fourth Proportional to 67.44, 100.61 and 57.18

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Solution

The fourth proportional to 67.44, 100.61 and 57.18 is: 85.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.44 : 100.61 = 57.18 : x
  2. Step 2: Convert to fraction form
    67.44/100.61 = 57.18/x
  3. Step 3: Cross multiply
    67.44x = 100.61 × 57.18
  4. Step 4: Simplify right side
    67.44x = 5,753.02
  5. Step 5: Solve for x
    x = 5,753.02/67.44
  6. Step 6: Final answer
    x = 85.31

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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.