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Finding the Fourth Proportional to 38.20, 52.64 and 30.88

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Solution

The fourth proportional to 38.20, 52.64 and 30.88 is: 42.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.20 : 52.64 = 30.88 : x
  2. Step 2: Convert to fraction form
    38.20/52.64 = 30.88/x
  3. Step 3: Cross multiply
    38.20x = 52.64 × 30.88
  4. Step 4: Simplify right side
    38.20x = 1,625.52
  5. Step 5: Solve for x
    x = 1,625.52/38.20
  6. Step 6: Final answer
    x = 42.55

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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.