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Finding the Fourth Proportional to 911.67, 1,367.55 and 326.38

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Solution

The fourth proportional to 911.67, 1,367.55 and 326.38 is: 489.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.67 : 1,367.55 = 326.38 : x
  2. Step 2: Convert to fraction form
    911.67/1,367.55 = 326.38/x
  3. Step 3: Cross multiply
    911.67x = 1,367.55 × 326.38
  4. Step 4: Simplify right side
    911.67x = 446,332.50
  5. Step 5: Solve for x
    x = 446,332.50/911.67
  6. Step 6: Final answer
    x = 489.58

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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.