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Finding the Fourth Proportional to 104.30, 143.90 and 74.79

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Solution

The fourth proportional to 104.30, 143.90 and 74.79 is: 103.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.30 : 143.90 = 74.79 : x
  2. Step 2: Convert to fraction form
    104.30/143.90 = 74.79/x
  3. Step 3: Cross multiply
    104.30x = 143.90 × 74.79
  4. Step 4: Simplify right side
    104.30x = 10,761.91
  5. Step 5: Solve for x
    x = 10,761.91/104.30
  6. Step 6: Final answer
    x = 103.19

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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.