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Finding the Fourth Proportional to 129.96, 194.70 and 69.06

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Solution

The fourth proportional to 129.96, 194.70 and 69.06 is: 103.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.96 : 194.70 = 69.06 : x
  2. Step 2: Convert to fraction form
    129.96/194.70 = 69.06/x
  3. Step 3: Cross multiply
    129.96x = 194.70 × 69.06
  4. Step 4: Simplify right side
    129.96x = 13,445.98
  5. Step 5: Solve for x
    x = 13,445.98/129.96
  6. Step 6: Final answer
    x = 103.46

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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.