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Finding the Fourth Proportional to 129.54, 194.72 and 109.29

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Solution

The fourth proportional to 129.54, 194.72 and 109.29 is: 164.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.54 : 194.72 = 109.29 : x
  2. Step 2: Convert to fraction form
    129.54/194.72 = 109.29/x
  3. Step 3: Cross multiply
    129.54x = 194.72 × 109.29
  4. Step 4: Simplify right side
    129.54x = 21,280.40
  5. Step 5: Solve for x
    x = 21,280.40/129.54
  6. Step 6: Final answer
    x = 164.28

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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.