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Finding the Fourth Proportional to 46.80, 69.92 and 38.72

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Solution

The fourth proportional to 46.80, 69.92 and 38.72 is: 57.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.80 : 69.92 = 38.72 : x
  2. Step 2: Convert to fraction form
    46.80/69.92 = 38.72/x
  3. Step 3: Cross multiply
    46.80x = 69.92 × 38.72
  4. Step 4: Simplify right side
    46.80x = 2,707.30
  5. Step 5: Solve for x
    x = 2,707.30/46.80
  6. Step 6: Final answer
    x = 57.85

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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.