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Finding the Fourth Proportional to 516.83, 712.62 and 392.18

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Solution

The fourth proportional to 516.83, 712.62 and 392.18 is: 540.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.83 : 712.62 = 392.18 : x
  2. Step 2: Convert to fraction form
    516.83/712.62 = 392.18/x
  3. Step 3: Cross multiply
    516.83x = 712.62 × 392.18
  4. Step 4: Simplify right side
    516.83x = 279,471.75
  5. Step 5: Solve for x
    x = 279,471.75/516.83
  6. Step 6: Final answer
    x = 540.75

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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.