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Finding the Fourth Proportional to 516.99, 713.45 and 280.94

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Solution

The fourth proportional to 516.99, 713.45 and 280.94 is: 387.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.99 : 713.45 = 280.94 : x
  2. Step 2: Convert to fraction form
    516.99/713.45 = 280.94/x
  3. Step 3: Cross multiply
    516.99x = 713.45 × 280.94
  4. Step 4: Simplify right side
    516.99x = 200,432.99
  5. Step 5: Solve for x
    x = 200,432.99/516.99
  6. Step 6: Final answer
    x = 387.70

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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.