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Finding the Fourth Proportional to 512.50, 768.65 and 147.21

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Solution

The fourth proportional to 512.50, 768.65 and 147.21 is: 220.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.50 : 768.65 = 147.21 : x
  2. Step 2: Convert to fraction form
    512.50/768.65 = 147.21/x
  3. Step 3: Cross multiply
    512.50x = 768.65 × 147.21
  4. Step 4: Simplify right side
    512.50x = 113,152.97
  5. Step 5: Solve for x
    x = 113,152.97/512.50
  6. Step 6: Final answer
    x = 220.79

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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.