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Finding the Fourth Proportional to 85.48, 127.21 and 85.24

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Solution

The fourth proportional to 85.48, 127.21 and 85.24 is: 126.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.48 : 127.21 = 85.24 : x
  2. Step 2: Convert to fraction form
    85.48/127.21 = 85.24/x
  3. Step 3: Cross multiply
    85.48x = 127.21 × 85.24
  4. Step 4: Simplify right side
    85.48x = 10,843.38
  5. Step 5: Solve for x
    x = 10,843.38/85.48
  6. Step 6: Final answer
    x = 126.85

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Double scale
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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.