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Finding the Fourth Proportional to 516.43, 712.79 and 329.89

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Solution

The fourth proportional to 516.43, 712.79 and 329.89 is: 455.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.43 : 712.79 = 329.89 : x
  2. Step 2: Convert to fraction form
    516.43/712.79 = 329.89/x
  3. Step 3: Cross multiply
    516.43x = 712.79 × 329.89
  4. Step 4: Simplify right side
    516.43x = 235,142.29
  5. Step 5: Solve for x
    x = 235,142.29/516.43
  6. Step 6: Final answer
    x = 455.32

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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.