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Finding the Fourth Proportional to 909.01, 1,363.11 and 818.56

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Solution

The fourth proportional to 909.01, 1,363.11 and 818.56 is: 1,227.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.01 : 1,363.11 = 818.56 : x
  2. Step 2: Convert to fraction form
    909.01/1,363.11 = 818.56/x
  3. Step 3: Cross multiply
    909.01x = 1,363.11 × 818.56
  4. Step 4: Simplify right side
    909.01x = 1,115,787.32
  5. Step 5: Solve for x
    x = 1,115,787.32/909.01
  6. Step 6: Final answer
    x = 1,227.48

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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.