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Finding the Fourth Proportional to 133.14, 183.76 and 81.40

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Solution

The fourth proportional to 133.14, 183.76 and 81.40 is: 112.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.14 : 183.76 = 81.40 : x
  2. Step 2: Convert to fraction form
    133.14/183.76 = 81.40/x
  3. Step 3: Cross multiply
    133.14x = 183.76 × 81.40
  4. Step 4: Simplify right side
    133.14x = 14,958.06
  5. Step 5: Solve for x
    x = 14,958.06/133.14
  6. Step 6: Final answer
    x = 112.35

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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.