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Finding the Fourth Proportional to 133.56, 184.32 and 81.15

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Solution

The fourth proportional to 133.56, 184.32 and 81.15 is: 111.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.56 : 184.32 = 81.15 : x
  2. Step 2: Convert to fraction form
    133.56/184.32 = 81.15/x
  3. Step 3: Cross multiply
    133.56x = 184.32 × 81.15
  4. Step 4: Simplify right side
    133.56x = 14,957.57
  5. Step 5: Solve for x
    x = 14,957.57/133.56
  6. Step 6: Final answer
    x = 111.99

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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.