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Finding the Fourth Proportional to 516.63, 712.67 and 392.09

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Solution

The fourth proportional to 516.63, 712.67 and 392.09 is: 540.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.63 : 712.67 = 392.09 : x
  2. Step 2: Convert to fraction form
    516.63/712.67 = 392.09/x
  3. Step 3: Cross multiply
    516.63x = 712.67 × 392.09
  4. Step 4: Simplify right side
    516.63x = 279,429.27
  5. Step 5: Solve for x
    x = 279,429.27/516.63
  6. Step 6: Final answer
    x = 540.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.