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Finding the Fourth Proportional to 84.95, 127.25 and 67.86

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Solution

The fourth proportional to 84.95, 127.25 and 67.86 is: 101.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.95 : 127.25 = 67.86 : x
  2. Step 2: Convert to fraction form
    84.95/127.25 = 67.86/x
  3. Step 3: Cross multiply
    84.95x = 127.25 × 67.86
  4. Step 4: Simplify right side
    84.95x = 8,635.19
  5. Step 5: Solve for x
    x = 8,635.19/84.95
  6. Step 6: Final answer
    x = 101.65

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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.