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Finding the Fourth Proportional to 129.69, 193.16 and 128.34

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Solution

The fourth proportional to 129.69, 193.16 and 128.34 is: 191.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.69 : 193.16 = 128.34 : x
  2. Step 2: Convert to fraction form
    129.69/193.16 = 128.34/x
  3. Step 3: Cross multiply
    129.69x = 193.16 × 128.34
  4. Step 4: Simplify right side
    129.69x = 24,790.48
  5. Step 5: Solve for x
    x = 24,790.48/129.69
  6. Step 6: Final answer
    x = 191.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.