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Finding the Fourth Proportional to 144.77, 217.22 and 67.78

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Solution

The fourth proportional to 144.77, 217.22 and 67.78 is: 101.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.77 : 217.22 = 67.78 : x
  2. Step 2: Convert to fraction form
    144.77/217.22 = 67.78/x
  3. Step 3: Cross multiply
    144.77x = 217.22 × 67.78
  4. Step 4: Simplify right side
    144.77x = 14,723.10
  5. Step 5: Solve for x
    x = 14,723.10/144.77
  6. Step 6: Final answer
    x = 101.70

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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.