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Finding the Fourth Proportional to 516.79, 775.38 and 311.50

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Solution

The fourth proportional to 516.79, 775.38 and 311.50 is: 467.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.79 : 775.38 = 311.50 : x
  2. Step 2: Convert to fraction form
    516.79/775.38 = 311.50/x
  3. Step 3: Cross multiply
    516.79x = 775.38 × 311.50
  4. Step 4: Simplify right side
    516.79x = 241,530.87
  5. Step 5: Solve for x
    x = 241,530.87/516.79
  6. Step 6: Final answer
    x = 467.37

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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.