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Finding the Fourth Proportional to 129.40, 193.98 and 109.24

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Solution

The fourth proportional to 129.40, 193.98 and 109.24 is: 163.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.40 : 193.98 = 109.24 : x
  2. Step 2: Convert to fraction form
    129.40/193.98 = 109.24/x
  3. Step 3: Cross multiply
    129.40x = 193.98 × 109.24
  4. Step 4: Simplify right side
    129.40x = 21,190.38
  5. Step 5: Solve for x
    x = 21,190.38/129.40
  6. Step 6: Final answer
    x = 163.76

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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.