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Finding the Fourth Proportional to 84.76, 127 and 66.64

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Solution

The fourth proportional to 84.76, 127 and 66.64 is: 99.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.76 : 127 = 66.64 : x
  2. Step 2: Convert to fraction form
    84.76/127 = 66.64/x
  3. Step 3: Cross multiply
    84.76x = 127 × 66.64
  4. Step 4: Simplify right side
    84.76x = 8,463.28
  5. Step 5: Solve for x
    x = 8,463.28/84.76
  6. Step 6: Final answer
    x = 99.85

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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.