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Finding the Fourth Proportional to 68.72, 103.20 and 55.28

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Solution

The fourth proportional to 68.72, 103.20 and 55.28 is: 83.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.72 : 103.20 = 55.28 : x
  2. Step 2: Convert to fraction form
    68.72/103.20 = 55.28/x
  3. Step 3: Cross multiply
    68.72x = 103.20 × 55.28
  4. Step 4: Simplify right side
    68.72x = 5,704.90
  5. Step 5: Solve for x
    x = 5,704.90/68.72
  6. Step 6: Final answer
    x = 83.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.