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Finding the Fourth Proportional to 104.22, 143.90 and 71.54

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Solution

The fourth proportional to 104.22, 143.90 and 71.54 is: 98.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.22 : 143.90 = 71.54 : x
  2. Step 2: Convert to fraction form
    104.22/143.90 = 71.54/x
  3. Step 3: Cross multiply
    104.22x = 143.90 × 71.54
  4. Step 4: Simplify right side
    104.22x = 10,294.61
  5. Step 5: Solve for x
    x = 10,294.61/104.22
  6. Step 6: Final answer
    x = 98.78

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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.