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Finding the Fourth Proportional to 40.96, 60.80 and 39.68

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Solution

The fourth proportional to 40.96, 60.80 and 39.68 is: 58.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.96 : 60.80 = 39.68 : x
  2. Step 2: Convert to fraction form
    40.96/60.80 = 39.68/x
  3. Step 3: Cross multiply
    40.96x = 60.80 × 39.68
  4. Step 4: Simplify right side
    40.96x = 2,412.54
  5. Step 5: Solve for x
    x = 2,412.54/40.96
  6. Step 6: Final answer
    x = 58.90

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.