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Finding the Fourth Proportional to 41.65, 57.40 and 38.90

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Solution

The fourth proportional to 41.65, 57.40 and 38.90 is: 53.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.65 : 57.40 = 38.90 : x
  2. Step 2: Convert to fraction form
    41.65/57.40 = 38.90/x
  3. Step 3: Cross multiply
    41.65x = 57.40 × 38.90
  4. Step 4: Simplify right side
    41.65x = 2,232.91
  5. Step 5: Solve for x
    x = 2,232.91/41.65
  6. Step 6: Final answer
    x = 53.61

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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.