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Finding the Fourth Proportional to 43.80, 66.09 and 40.56

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Solution

The fourth proportional to 43.80, 66.09 and 40.56 is: 61.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.80 : 66.09 = 40.56 : x
  2. Step 2: Convert to fraction form
    43.80/66.09 = 40.56/x
  3. Step 3: Cross multiply
    43.80x = 66.09 × 40.56
  4. Step 4: Simplify right side
    43.80x = 2,680.61
  5. Step 5: Solve for x
    x = 2,680.61/43.80
  6. Step 6: Final answer
    x = 61.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.