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Finding the Fourth Proportional to 129.92, 194.70 and 68.96

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Solution

The fourth proportional to 129.92, 194.70 and 68.96 is: 103.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.92 : 194.70 = 68.96 : x
  2. Step 2: Convert to fraction form
    129.92/194.70 = 68.96/x
  3. Step 3: Cross multiply
    129.92x = 194.70 × 68.96
  4. Step 4: Simplify right side
    129.92x = 13,426.51
  5. Step 5: Solve for x
    x = 13,426.51/129.92
  6. Step 6: Final answer
    x = 103.34

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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.