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Finding the Fourth Proportional to 104.39, 143.98 and 91.24

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Solution

The fourth proportional to 104.39, 143.98 and 91.24 is: 125.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.39 : 143.98 = 91.24 : x
  2. Step 2: Convert to fraction form
    104.39/143.98 = 91.24/x
  3. Step 3: Cross multiply
    104.39x = 143.98 × 91.24
  4. Step 4: Simplify right side
    104.39x = 13,136.96
  5. Step 5: Solve for x
    x = 13,136.96/104.39
  6. Step 6: Final answer
    x = 125.85

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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.