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Finding the Fourth Proportional to 149.72, 224.69 and 81.26

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Solution

The fourth proportional to 149.72, 224.69 and 81.26 is: 121.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.72 : 224.69 = 81.26 : x
  2. Step 2: Convert to fraction form
    149.72/224.69 = 81.26/x
  3. Step 3: Cross multiply
    149.72x = 224.69 × 81.26
  4. Step 4: Simplify right side
    149.72x = 18,256.78
  5. Step 5: Solve for x
    x = 18,256.78/149.72
  6. Step 6: Final answer
    x = 121.94

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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.