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Finding the Fourth Proportional to 38.68, 57.65 and 34.12

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Solution

The fourth proportional to 38.68, 57.65 and 34.12 is: 50.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.68 : 57.65 = 34.12 : x
  2. Step 2: Convert to fraction form
    38.68/57.65 = 34.12/x
  3. Step 3: Cross multiply
    38.68x = 57.65 × 34.12
  4. Step 4: Simplify right side
    38.68x = 1,967.02
  5. Step 5: Solve for x
    x = 1,967.02/38.68
  6. Step 6: Final answer
    x = 50.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.