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Finding the Fourth Proportional to 516.96, 775.43 and 208.80

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Solution

The fourth proportional to 516.96, 775.43 and 208.80 is: 313.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.96 : 775.43 = 208.80 : x
  2. Step 2: Convert to fraction form
    516.96/775.43 = 208.80/x
  3. Step 3: Cross multiply
    516.96x = 775.43 × 208.80
  4. Step 4: Simplify right side
    516.96x = 161,909.78
  5. Step 5: Solve for x
    x = 161,909.78/516.96
  6. Step 6: Final answer
    x = 313.20

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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.