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Finding the Fourth Proportional to 41.28, 56.92 and 39

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Solution

The fourth proportional to 41.28, 56.92 and 39 is: 53.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.28 : 56.92 = 39 : x
  2. Step 2: Convert to fraction form
    41.28/56.92 = 39/x
  3. Step 3: Cross multiply
    41.28x = 56.92 × 39
  4. Step 4: Simplify right side
    41.28x = 2,219.88
  5. Step 5: Solve for x
    x = 2,219.88/41.28
  6. Step 6: Final answer
    x = 53.78

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1.5x scale

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.