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Finding the Fourth Proportional to 97.81, 146.72 and 54.52

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Solution

The fourth proportional to 97.81, 146.72 and 54.52 is: 81.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.81 : 146.72 = 54.52 : x
  2. Step 2: Convert to fraction form
    97.81/146.72 = 54.52/x
  3. Step 3: Cross multiply
    97.81x = 146.72 × 54.52
  4. Step 4: Simplify right side
    97.81x = 7,998.94
  5. Step 5: Solve for x
    x = 7,998.94/97.81
  6. Step 6: Final answer
    x = 81.78

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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.