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Finding the Fourth Proportional to 513.12, 769.68 and 480.72

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Solution

The fourth proportional to 513.12, 769.68 and 480.72 is: 721.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.12 : 769.68 = 480.72 : x
  2. Step 2: Convert to fraction form
    513.12/769.68 = 480.72/x
  3. Step 3: Cross multiply
    513.12x = 769.68 × 480.72
  4. Step 4: Simplify right side
    513.12x = 370,000.57
  5. Step 5: Solve for x
    x = 370,000.57/513.12
  6. Step 6: Final answer
    x = 721.08

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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.