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Finding the Fourth Proportional to 40.80, 61.16 and 27.96

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Solution

The fourth proportional to 40.80, 61.16 and 27.96 is: 41.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.80 : 61.16 = 27.96 : x
  2. Step 2: Convert to fraction form
    40.80/61.16 = 27.96/x
  3. Step 3: Cross multiply
    40.80x = 61.16 × 27.96
  4. Step 4: Simplify right side
    40.80x = 1,710.12
  5. Step 5: Solve for x
    x = 1,710.12/40.80
  6. Step 6: Final answer
    x = 41.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.