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Finding the Fourth Proportional to 85.24, 127.86 and 67.15

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Solution

The fourth proportional to 85.24, 127.86 and 67.15 is: 100.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.24 : 127.86 = 67.15 : x
  2. Step 2: Convert to fraction form
    85.24/127.86 = 67.15/x
  3. Step 3: Cross multiply
    85.24x = 127.86 × 67.15
  4. Step 4: Simplify right side
    85.24x = 8,585.80
  5. Step 5: Solve for x
    x = 8,585.80/85.24
  6. Step 6: Final answer
    x = 100.73

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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.