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Finding the Fourth Proportional to 809.01, 1,211.23 and 515.79

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Solution

The fourth proportional to 809.01, 1,211.23 and 515.79 is: 772.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.01 : 1,211.23 = 515.79 : x
  2. Step 2: Convert to fraction form
    809.01/1,211.23 = 515.79/x
  3. Step 3: Cross multiply
    809.01x = 1,211.23 × 515.79
  4. Step 4: Simplify right side
    809.01x = 624,740.32
  5. Step 5: Solve for x
    x = 624,740.32/809.01
  6. Step 6: Final answer
    x = 772.23

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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.