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Finding the Fourth Proportional to 512.88, 769.32 and 128.12

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Solution

The fourth proportional to 512.88, 769.32 and 128.12 is: 192.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.88 : 769.32 = 128.12 : x
  2. Step 2: Convert to fraction form
    512.88/769.32 = 128.12/x
  3. Step 3: Cross multiply
    512.88x = 769.32 × 128.12
  4. Step 4: Simplify right side
    512.88x = 98,565.28
  5. Step 5: Solve for x
    x = 98,565.28/512.88
  6. Step 6: Final answer
    x = 192.18

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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.