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Finding the Fourth Proportional to 824.22, 1,238.45 and 516.21

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Solution

The fourth proportional to 824.22, 1,238.45 and 516.21 is: 775.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.22 : 1,238.45 = 516.21 : x
  2. Step 2: Convert to fraction form
    824.22/1,238.45 = 516.21/x
  3. Step 3: Cross multiply
    824.22x = 1,238.45 × 516.21
  4. Step 4: Simplify right side
    824.22x = 639,300.27
  5. Step 5: Solve for x
    x = 639,300.27/824.22
  6. Step 6: Final answer
    x = 775.64

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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.