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Finding the Fourth Proportional to 513.09, 769.46 and 147.78

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Solution

The fourth proportional to 513.09, 769.46 and 147.78 is: 221.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.09 : 769.46 = 147.78 : x
  2. Step 2: Convert to fraction form
    513.09/769.46 = 147.78/x
  3. Step 3: Cross multiply
    513.09x = 769.46 × 147.78
  4. Step 4: Simplify right side
    513.09x = 113,710.80
  5. Step 5: Solve for x
    x = 113,710.80/513.09
  6. Step 6: Final answer
    x = 221.62

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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.