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Finding the Fourth Proportional to 133.49, 184.12 and 81.74

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Solution

The fourth proportional to 133.49, 184.12 and 81.74 is: 112.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.49 : 184.12 = 81.74 : x
  2. Step 2: Convert to fraction form
    133.49/184.12 = 81.74/x
  3. Step 3: Cross multiply
    133.49x = 184.12 × 81.74
  4. Step 4: Simplify right side
    133.49x = 15,048.64
  5. Step 5: Solve for x
    x = 15,048.64/133.49
  6. Step 6: Final answer
    x = 112.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.