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Finding the Fourth Proportional to 104.67, 144.31 and 67.78

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Solution

The fourth proportional to 104.67, 144.31 and 67.78 is: 93.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.67 : 144.31 = 67.78 : x
  2. Step 2: Convert to fraction form
    104.67/144.31 = 67.78/x
  3. Step 3: Cross multiply
    104.67x = 144.31 × 67.78
  4. Step 4: Simplify right side
    104.67x = 9,781.33
  5. Step 5: Solve for x
    x = 9,781.33/104.67
  6. Step 6: Final answer
    x = 93.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.