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Finding the Fourth Proportional to 38.48, 57.72 and 30.88

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Solution

The fourth proportional to 38.48, 57.72 and 30.88 is: 46.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.48 : 57.72 = 30.88 : x
  2. Step 2: Convert to fraction form
    38.48/57.72 = 30.88/x
  3. Step 3: Cross multiply
    38.48x = 57.72 × 30.88
  4. Step 4: Simplify right side
    38.48x = 1,782.39
  5. Step 5: Solve for x
    x = 1,782.39/38.48
  6. Step 6: Final answer
    x = 46.32

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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.