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Finding the Fourth Proportional to 512.85, 769.40 and 147.63

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Solution

The fourth proportional to 512.85, 769.40 and 147.63 is: 221.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.85 : 769.40 = 147.63 : x
  2. Step 2: Convert to fraction form
    512.85/769.40 = 147.63/x
  3. Step 3: Cross multiply
    512.85x = 769.40 × 147.63
  4. Step 4: Simplify right side
    512.85x = 113,585.78
  5. Step 5: Solve for x
    x = 113,585.78/512.85
  6. Step 6: Final answer
    x = 221.48

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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.