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Finding the Fourth Proportional to 38.72, 57.90 and 34.67

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Solution

The fourth proportional to 38.72, 57.90 and 34.67 is: 51.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.72 : 57.90 = 34.67 : x
  2. Step 2: Convert to fraction form
    38.72/57.90 = 34.67/x
  3. Step 3: Cross multiply
    38.72x = 57.90 × 34.67
  4. Step 4: Simplify right side
    38.72x = 2,007.67
  5. Step 5: Solve for x
    x = 2,007.67/38.72
  6. Step 6: Final answer
    x = 51.85

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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.