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Finding the Fourth Proportional to 512.97, 769.46 and 128.22

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Solution

The fourth proportional to 512.97, 769.46 and 128.22 is: 192.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.97 : 769.46 = 128.22 : x
  2. Step 2: Convert to fraction form
    512.97/769.46 = 128.22/x
  3. Step 3: Cross multiply
    512.97x = 769.46 × 128.22
  4. Step 4: Simplify right side
    512.97x = 98,660.16
  5. Step 5: Solve for x
    x = 98,660.16/512.97
  6. Step 6: Final answer
    x = 192.33

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Double scale
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Similar ratio
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1.5x scale

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.