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Finding the Fourth Proportional to 516.03, 712.31 and 391.68

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Solution

The fourth proportional to 516.03, 712.31 and 391.68 is: 540.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.03 : 712.31 = 391.68 : x
  2. Step 2: Convert to fraction form
    516.03/712.31 = 391.68/x
  3. Step 3: Cross multiply
    516.03x = 712.31 × 391.68
  4. Step 4: Simplify right side
    516.03x = 278,995.00
  5. Step 5: Solve for x
    x = 278,995.00/516.03
  6. Step 6: Final answer
    x = 540.66

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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.