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Finding the Fourth Proportional to 133.40, 183.56 and 129.81

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Solution

The fourth proportional to 133.40, 183.56 and 129.81 is: 178.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.40 : 183.56 = 129.81 : x
  2. Step 2: Convert to fraction form
    133.40/183.56 = 129.81/x
  3. Step 3: Cross multiply
    133.40x = 183.56 × 129.81
  4. Step 4: Simplify right side
    133.40x = 23,827.27
  5. Step 5: Solve for x
    x = 23,827.27/133.40
  6. Step 6: Final answer
    x = 178.62

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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.