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Finding the Fourth Proportional to 516.20, 771.38 and 372.20

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Solution

The fourth proportional to 516.20, 771.38 and 372.20 is: 556.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.20 : 771.38 = 372.20 : x
  2. Step 2: Convert to fraction form
    516.20/771.38 = 372.20/x
  3. Step 3: Cross multiply
    516.20x = 771.38 × 372.20
  4. Step 4: Simplify right side
    516.20x = 287,107.64
  5. Step 5: Solve for x
    x = 287,107.64/516.20
  6. Step 6: Final answer
    x = 556.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.