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Finding the Fourth Proportional to 144.92, 217.18 and 87.21

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Solution

The fourth proportional to 144.92, 217.18 and 87.21 is: 130.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.92 : 217.18 = 87.21 : x
  2. Step 2: Convert to fraction form
    144.92/217.18 = 87.21/x
  3. Step 3: Cross multiply
    144.92x = 217.18 × 87.21
  4. Step 4: Simplify right side
    144.92x = 18,940.38
  5. Step 5: Solve for x
    x = 18,940.38/144.92
  6. Step 6: Final answer
    x = 130.69

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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.