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Finding the Fourth Proportional to 41.72, 57.18 and 40.48

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Solution

The fourth proportional to 41.72, 57.18 and 40.48 is: 55.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.72 : 57.18 = 40.48 : x
  2. Step 2: Convert to fraction form
    41.72/57.18 = 40.48/x
  3. Step 3: Cross multiply
    41.72x = 57.18 × 40.48
  4. Step 4: Simplify right side
    41.72x = 2,314.65
  5. Step 5: Solve for x
    x = 2,314.65/41.72
  6. Step 6: Final answer
    x = 55.48

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.