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Finding the Fourth Proportional to 38, 52.48 and 30.76

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Solution

The fourth proportional to 38, 52.48 and 30.76 is: 42.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    38 : 52.48 = 30.76 : x
  2. Step 2: Convert to fraction form
    38/52.48 = 30.76/x
  3. Step 3: Cross multiply
    38x = 52.48 × 30.76
  4. Step 4: Simplify right side
    38x = 1,614.28
  5. Step 5: Solve for x
    x = 1,614.28/38
  6. Step 6: Final answer
    x = 42.48

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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.