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Finding the Fourth Proportional to 55.20, 82.74 and 43.80

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Solution

The fourth proportional to 55.20, 82.74 and 43.80 is: 65.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.20 : 82.74 = 43.80 : x
  2. Step 2: Convert to fraction form
    55.20/82.74 = 43.80/x
  3. Step 3: Cross multiply
    55.20x = 82.74 × 43.80
  4. Step 4: Simplify right side
    55.20x = 3,624.01
  5. Step 5: Solve for x
    x = 3,624.01/55.20
  6. Step 6: Final answer
    x = 65.65

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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.