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Finding the Fourth Proportional to 144.86, 217.32 and 71.79

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Solution

The fourth proportional to 144.86, 217.32 and 71.79 is: 107.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.86 : 217.32 = 71.79 : x
  2. Step 2: Convert to fraction form
    144.86/217.32 = 71.79/x
  3. Step 3: Cross multiply
    144.86x = 217.32 × 71.79
  4. Step 4: Simplify right side
    144.86x = 15,601.40
  5. Step 5: Solve for x
    x = 15,601.40/144.86
  6. Step 6: Final answer
    x = 107.70

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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.