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Finding the Fourth Proportional to 54.06, 81.05 and 21.53

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Solution

The fourth proportional to 54.06, 81.05 and 21.53 is: 32.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.06 : 81.05 = 21.53 : x
  2. Step 2: Convert to fraction form
    54.06/81.05 = 21.53/x
  3. Step 3: Cross multiply
    54.06x = 81.05 × 21.53
  4. Step 4: Simplify right side
    54.06x = 1,744.90
  5. Step 5: Solve for x
    x = 1,744.90/54.06
  6. Step 6: Final answer
    x = 32.28

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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.