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Finding the Fourth Proportional to 95.54, 142.21 and 85.28

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Solution

The fourth proportional to 95.54, 142.21 and 85.28 is: 126.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.54 : 142.21 = 85.28 : x
  2. Step 2: Convert to fraction form
    95.54/142.21 = 85.28/x
  3. Step 3: Cross multiply
    95.54x = 142.21 × 85.28
  4. Step 4: Simplify right side
    95.54x = 12,127.67
  5. Step 5: Solve for x
    x = 12,127.67/95.54
  6. Step 6: Final answer
    x = 126.94

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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.