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Finding the Fourth Proportional to 129.98, 195.92 and 128.16

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Solution

The fourth proportional to 129.98, 195.92 and 128.16 is: 193.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.98 : 195.92 = 128.16 : x
  2. Step 2: Convert to fraction form
    129.98/195.92 = 128.16/x
  3. Step 3: Cross multiply
    129.98x = 195.92 × 128.16
  4. Step 4: Simplify right side
    129.98x = 25,108.13
  5. Step 5: Solve for x
    x = 25,108.13/129.98
  6. Step 6: Final answer
    x = 193.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.