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Finding the Fourth Proportional to 512.30, 768.47 and 187.65

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Solution

The fourth proportional to 512.30, 768.47 and 187.65 is: 281.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.30 : 768.47 = 187.65 : x
  2. Step 2: Convert to fraction form
    512.30/768.47 = 187.65/x
  3. Step 3: Cross multiply
    512.30x = 768.47 × 187.65
  4. Step 4: Simplify right side
    512.30x = 144,202.46
  5. Step 5: Solve for x
    x = 144,202.46/512.30
  6. Step 6: Final answer
    x = 281.48

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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.