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Finding the Fourth Proportional to 54.68, 82.20 and 42.71

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Solution

The fourth proportional to 54.68, 82.20 and 42.71 is: 64.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.68 : 82.20 = 42.71 : x
  2. Step 2: Convert to fraction form
    54.68/82.20 = 42.71/x
  3. Step 3: Cross multiply
    54.68x = 82.20 × 42.71
  4. Step 4: Simplify right side
    54.68x = 3,510.76
  5. Step 5: Solve for x
    x = 3,510.76/54.68
  6. Step 6: Final answer
    x = 64.21

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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.