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Finding the Fourth Proportional to 512.61, 768.78 and 187.80

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Solution

The fourth proportional to 512.61, 768.78 and 187.80 is: 281.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.61 : 768.78 = 187.80 : x
  2. Step 2: Convert to fraction form
    512.61/768.78 = 187.80/x
  3. Step 3: Cross multiply
    512.61x = 768.78 × 187.80
  4. Step 4: Simplify right side
    512.61x = 144,376.88
  5. Step 5: Solve for x
    x = 144,376.88/512.61
  6. Step 6: Final answer
    x = 281.65

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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.