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Finding the Fourth Proportional to 54.81, 82.25 and 52.15

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Solution

The fourth proportional to 54.81, 82.25 and 52.15 is: 78.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.81 : 82.25 = 52.15 : x
  2. Step 2: Convert to fraction form
    54.81/82.25 = 52.15/x
  3. Step 3: Cross multiply
    54.81x = 82.25 × 52.15
  4. Step 4: Simplify right side
    54.81x = 4,289.34
  5. Step 5: Solve for x
    x = 4,289.34/54.81
  6. Step 6: Final answer
    x = 78.26

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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.