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Finding the Fourth Proportional to 85, 127.26 and 64.72

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Solution

The fourth proportional to 85, 127.26 and 64.72 is: 96.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85 : 127.26 = 64.72 : x
  2. Step 2: Convert to fraction form
    85/127.26 = 64.72/x
  3. Step 3: Cross multiply
    85x = 127.26 × 64.72
  4. Step 4: Simplify right side
    85x = 8,236.27
  5. Step 5: Solve for x
    x = 8,236.27/85
  6. Step 6: Final answer
    x = 96.90

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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.