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Finding the Fourth Proportional to 50.72, 69.96 and 28.88

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Solution

The fourth proportional to 50.72, 69.96 and 28.88 is: 39.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.72 : 69.96 = 28.88 : x
  2. Step 2: Convert to fraction form
    50.72/69.96 = 28.88/x
  3. Step 3: Cross multiply
    50.72x = 69.96 × 28.88
  4. Step 4: Simplify right side
    50.72x = 2,020.10
  5. Step 5: Solve for x
    x = 2,020.10/50.72
  6. Step 6: Final answer
    x = 39.83

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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.