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Finding the Fourth Proportional to 104.43, 143.97 and 78.15

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Solution

The fourth proportional to 104.43, 143.97 and 78.15 is: 107.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.43 : 143.97 = 78.15 : x
  2. Step 2: Convert to fraction form
    104.43/143.97 = 78.15/x
  3. Step 3: Cross multiply
    104.43x = 143.97 × 78.15
  4. Step 4: Simplify right side
    104.43x = 11,251.26
  5. Step 5: Solve for x
    x = 11,251.26/104.43
  6. Step 6: Final answer
    x = 107.74

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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.