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Finding the Fourth Proportional to 808.87, 1,213.26 and 288.85

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Solution

The fourth proportional to 808.87, 1,213.26 and 288.85 is: 433.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.87 : 1,213.26 = 288.85 : x
  2. Step 2: Convert to fraction form
    808.87/1,213.26 = 288.85/x
  3. Step 3: Cross multiply
    808.87x = 1,213.26 × 288.85
  4. Step 4: Simplify right side
    808.87x = 350,450.15
  5. Step 5: Solve for x
    x = 350,450.15/808.87
  6. Step 6: Final answer
    x = 433.26

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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.