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Finding the Fourth Proportional to 516.78, 713.10 and 306.96

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Solution

The fourth proportional to 516.78, 713.10 and 306.96 is: 423.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.78 : 713.10 = 306.96 : x
  2. Step 2: Convert to fraction form
    516.78/713.10 = 306.96/x
  3. Step 3: Cross multiply
    516.78x = 713.10 × 306.96
  4. Step 4: Simplify right side
    516.78x = 218,893.18
  5. Step 5: Solve for x
    x = 218,893.18/516.78
  6. Step 6: Final answer
    x = 423.57

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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.