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Finding the Fourth Proportional to 54.48, 81.20 and 52.08

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Solution

The fourth proportional to 54.48, 81.20 and 52.08 is: 77.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.48 : 81.20 = 52.08 : x
  2. Step 2: Convert to fraction form
    54.48/81.20 = 52.08/x
  3. Step 3: Cross multiply
    54.48x = 81.20 × 52.08
  4. Step 4: Simplify right side
    54.48x = 4,228.90
  5. Step 5: Solve for x
    x = 4,228.90/54.48
  6. Step 6: Final answer
    x = 77.62

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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.