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Finding the Fourth Proportional to 129.22, 178.33 and 73.97

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Solution

The fourth proportional to 129.22, 178.33 and 73.97 is: 102.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.22 : 178.33 = 73.97 : x
  2. Step 2: Convert to fraction form
    129.22/178.33 = 73.97/x
  3. Step 3: Cross multiply
    129.22x = 178.33 × 73.97
  4. Step 4: Simplify right side
    129.22x = 13,189.99
  5. Step 5: Solve for x
    x = 13,189.99/129.22
  6. Step 6: Final answer
    x = 102.08

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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.