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Finding the Fourth Proportional to 131.49, 197.28 and 54.51

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Solution

The fourth proportional to 131.49, 197.28 and 54.51 is: 81.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.49 : 197.28 = 54.51 : x
  2. Step 2: Convert to fraction form
    131.49/197.28 = 54.51/x
  3. Step 3: Cross multiply
    131.49x = 197.28 × 54.51
  4. Step 4: Simplify right side
    131.49x = 10,753.73
  5. Step 5: Solve for x
    x = 10,753.73/131.49
  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.