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Finding the Fourth Proportional to 909.20, 1,363.92 and 331.92

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Solution

The fourth proportional to 909.20, 1,363.92 and 331.92 is: 497.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.20 : 1,363.92 = 331.92 : x
  2. Step 2: Convert to fraction form
    909.20/1,363.92 = 331.92/x
  3. Step 3: Cross multiply
    909.20x = 1,363.92 × 331.92
  4. Step 4: Simplify right side
    909.20x = 452,712.33
  5. Step 5: Solve for x
    x = 452,712.33/909.20
  6. Step 6: Final answer
    x = 497.92

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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.