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Finding the Fourth Proportional to 514.10, 769.20 and 315.73

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Solution

The fourth proportional to 514.10, 769.20 and 315.73 is: 472.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.10 : 769.20 = 315.73 : x
  2. Step 2: Convert to fraction form
    514.10/769.20 = 315.73/x
  3. Step 3: Cross multiply
    514.10x = 769.20 × 315.73
  4. Step 4: Simplify right side
    514.10x = 242,859.52
  5. Step 5: Solve for x
    x = 242,859.52/514.10
  6. Step 6: Final answer
    x = 472.40

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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.