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Finding the Fourth Proportional to 54.49, 81.34 and 54.35

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Solution

The fourth proportional to 54.49, 81.34 and 54.35 is: 81.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.49 : 81.34 = 54.35 : x
  2. Step 2: Convert to fraction form
    54.49/81.34 = 54.35/x
  3. Step 3: Cross multiply
    54.49x = 81.34 × 54.35
  4. Step 4: Simplify right side
    54.49x = 4,420.56
  5. Step 5: Solve for x
    x = 4,420.56/54.49
  6. Step 6: Final answer
    x = 81.13

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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.