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Finding the Fourth Proportional to 100.44, 138.62 and 67.79

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Solution

The fourth proportional to 100.44, 138.62 and 67.79 is: 93.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.44 : 138.62 = 67.79 : x
  2. Step 2: Convert to fraction form
    100.44/138.62 = 67.79/x
  3. Step 3: Cross multiply
    100.44x = 138.62 × 67.79
  4. Step 4: Simplify right side
    100.44x = 9,397.57
  5. Step 5: Solve for x
    x = 9,397.57/100.44
  6. Step 6: Final answer
    x = 93.56

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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.