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Finding the Fourth Proportional to 144.17, 216.09 and 86.42

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Solution

The fourth proportional to 144.17, 216.09 and 86.42 is: 129.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.17 : 216.09 = 86.42 : x
  2. Step 2: Convert to fraction form
    144.17/216.09 = 86.42/x
  3. Step 3: Cross multiply
    144.17x = 216.09 × 86.42
  4. Step 4: Simplify right side
    144.17x = 18,673.42
  5. Step 5: Solve for x
    x = 18,673.42/144.17
  6. Step 6: Final answer
    x = 129.53

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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.