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Finding the Fourth Proportional to 512.51, 768.78 and 127.75

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Solution

The fourth proportional to 512.51, 768.78 and 127.75 is: 191.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.51 : 768.78 = 127.75 : x
  2. Step 2: Convert to fraction form
    512.51/768.78 = 127.75/x
  3. Step 3: Cross multiply
    512.51x = 768.78 × 127.75
  4. Step 4: Simplify right side
    512.51x = 98,211.65
  5. Step 5: Solve for x
    x = 98,211.65/512.51
  6. Step 6: Final answer
    x = 191.63

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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.