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Finding the Fourth Proportional to 512.19, 768.51 and 187.65

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Solution

The fourth proportional to 512.19, 768.51 and 187.65 is: 281.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.19 : 768.51 = 187.65 : x
  2. Step 2: Convert to fraction form
    512.19/768.51 = 187.65/x
  3. Step 3: Cross multiply
    512.19x = 768.51 × 187.65
  4. Step 4: Simplify right side
    512.19x = 144,210.90
  5. Step 5: Solve for x
    x = 144,210.90/512.19
  6. Step 6: Final answer
    x = 281.56

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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.