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Finding the Fourth Proportional to 133.16, 183.72 and 81.44

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Solution

The fourth proportional to 133.16, 183.72 and 81.44 is: 112.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.16 : 183.72 = 81.44 : x
  2. Step 2: Convert to fraction form
    133.16/183.72 = 81.44/x
  3. Step 3: Cross multiply
    133.16x = 183.72 × 81.44
  4. Step 4: Simplify right side
    133.16x = 14,962.16
  5. Step 5: Solve for x
    x = 14,962.16/133.16
  6. Step 6: Final answer
    x = 112.36

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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.