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Finding the Fourth Proportional to 144.91, 217.28 and 58.21

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Solution

The fourth proportional to 144.91, 217.28 and 58.21 is: 87.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.91 : 217.28 = 58.21 : x
  2. Step 2: Convert to fraction form
    144.91/217.28 = 58.21/x
  3. Step 3: Cross multiply
    144.91x = 217.28 × 58.21
  4. Step 4: Simplify right side
    144.91x = 12,647.47
  5. Step 5: Solve for x
    x = 12,647.47/144.91
  6. Step 6: Final answer
    x = 87.28

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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.