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Finding the Fourth Proportional to 103.91, 143.17 and 76.24

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Solution

The fourth proportional to 103.91, 143.17 and 76.24 is: 105.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.91 : 143.17 = 76.24 : x
  2. Step 2: Convert to fraction form
    103.91/143.17 = 76.24/x
  3. Step 3: Cross multiply
    103.91x = 143.17 × 76.24
  4. Step 4: Simplify right side
    103.91x = 10,915.27
  5. Step 5: Solve for x
    x = 10,915.27/103.91
  6. Step 6: Final answer
    x = 105.05

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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.