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Finding the Fourth Proportional to 809.13, 1,211.67 and 515.73

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Solution

The fourth proportional to 809.13, 1,211.67 and 515.73 is: 772.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.13 : 1,211.67 = 515.73 : x
  2. Step 2: Convert to fraction form
    809.13/1,211.67 = 515.73/x
  3. Step 3: Cross multiply
    809.13x = 1,211.67 × 515.73
  4. Step 4: Simplify right side
    809.13x = 624,894.57
  5. Step 5: Solve for x
    x = 624,894.57/809.13
  6. Step 6: Final answer
    x = 772.30

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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.