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Finding the Fourth Proportional to 909.68, 1,363.82 and 422.37

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Solution

The fourth proportional to 909.68, 1,363.82 and 422.37 is: 633.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.68 : 1,363.82 = 422.37 : x
  2. Step 2: Convert to fraction form
    909.68/1,363.82 = 422.37/x
  3. Step 3: Cross multiply
    909.68x = 1,363.82 × 422.37
  4. Step 4: Simplify right side
    909.68x = 576,034.54
  5. Step 5: Solve for x
    x = 576,034.54/909.68
  6. Step 6: Final answer
    x = 633.23

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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.