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Finding the Fourth Proportional to 103.28, 142.48 and 63.91

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Solution

The fourth proportional to 103.28, 142.48 and 63.91 is: 88.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.28 : 142.48 = 63.91 : x
  2. Step 2: Convert to fraction form
    103.28/142.48 = 63.91/x
  3. Step 3: Cross multiply
    103.28x = 142.48 × 63.91
  4. Step 4: Simplify right side
    103.28x = 9,104.86
  5. Step 5: Solve for x
    x = 9,104.86/103.28
  6. Step 6: Final answer
    x = 88.16

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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.