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Finding the Fourth Proportional to 516.28, 712.71 and 329.80

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Solution

The fourth proportional to 516.28, 712.71 and 329.80 is: 455.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.28 : 712.71 = 329.80 : x
  2. Step 2: Convert to fraction form
    516.28/712.71 = 329.80/x
  3. Step 3: Cross multiply
    516.28x = 712.71 × 329.80
  4. Step 4: Simplify right side
    516.28x = 235,051.76
  5. Step 5: Solve for x
    x = 235,051.76/516.28
  6. Step 6: Final answer
    x = 455.28

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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.