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Finding the Fourth Proportional to 129.33, 194.06 and 71.55

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Solution

The fourth proportional to 129.33, 194.06 and 71.55 is: 107.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.33 : 194.06 = 71.55 : x
  2. Step 2: Convert to fraction form
    129.33/194.06 = 71.55/x
  3. Step 3: Cross multiply
    129.33x = 194.06 × 71.55
  4. Step 4: Simplify right side
    129.33x = 13,884.99
  5. Step 5: Solve for x
    x = 13,884.99/129.33
  6. Step 6: Final answer
    x = 107.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.