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Finding the Fourth Proportional to 54.71, 81.50 and 52.12

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Solution

The fourth proportional to 54.71, 81.50 and 52.12 is: 77.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.71 : 81.50 = 52.12 : x
  2. Step 2: Convert to fraction form
    54.71/81.50 = 52.12/x
  3. Step 3: Cross multiply
    54.71x = 81.50 × 52.12
  4. Step 4: Simplify right side
    54.71x = 4,247.78
  5. Step 5: Solve for x
    x = 4,247.78/54.71
  6. Step 6: Final answer
    x = 77.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.