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Finding the Fourth Proportional to 516.45, 776.49 and 426.54

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Solution

The fourth proportional to 516.45, 776.49 and 426.54 is: 641.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.45 : 776.49 = 426.54 : x
  2. Step 2: Convert to fraction form
    516.45/776.49 = 426.54/x
  3. Step 3: Cross multiply
    516.45x = 776.49 × 426.54
  4. Step 4: Simplify right side
    516.45x = 331,204.04
  5. Step 5: Solve for x
    x = 331,204.04/516.45
  6. Step 6: Final answer
    x = 641.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.