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Finding the Fourth Proportional to 104.47, 144.12 and 75.31

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Solution

The fourth proportional to 104.47, 144.12 and 75.31 is: 103.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.47 : 144.12 = 75.31 : x
  2. Step 2: Convert to fraction form
    104.47/144.12 = 75.31/x
  3. Step 3: Cross multiply
    104.47x = 144.12 × 75.31
  4. Step 4: Simplify right side
    104.47x = 10,853.68
  5. Step 5: Solve for x
    x = 10,853.68/104.47
  6. Step 6: Final answer
    x = 103.89

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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.