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Finding the Fourth Proportional to 829.62, 1,243.68 and 316.98

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Solution

The fourth proportional to 829.62, 1,243.68 and 316.98 is: 475.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.62 : 1,243.68 = 316.98 : x
  2. Step 2: Convert to fraction form
    829.62/1,243.68 = 316.98/x
  3. Step 3: Cross multiply
    829.62x = 1,243.68 × 316.98
  4. Step 4: Simplify right side
    829.62x = 394,221.69
  5. Step 5: Solve for x
    x = 394,221.69/829.62
  6. Step 6: Final answer
    x = 475.18

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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.