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Finding the Fourth Proportional to 512.76, 768.99 and 147.45

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Solution

The fourth proportional to 512.76, 768.99 and 147.45 is: 221.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.76 : 768.99 = 147.45 : x
  2. Step 2: Convert to fraction form
    512.76/768.99 = 147.45/x
  3. Step 3: Cross multiply
    512.76x = 768.99 × 147.45
  4. Step 4: Simplify right side
    512.76x = 113,387.58
  5. Step 5: Solve for x
    x = 113,387.58/512.76
  6. Step 6: Final answer
    x = 221.13

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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.