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Finding the Fourth Proportional to 811.69, 1,217.59 and 226.70

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Solution

The fourth proportional to 811.69, 1,217.59 and 226.70 is: 340.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.69 : 1,217.59 = 226.70 : x
  2. Step 2: Convert to fraction form
    811.69/1,217.59 = 226.70/x
  3. Step 3: Cross multiply
    811.69x = 1,217.59 × 226.70
  4. Step 4: Simplify right side
    811.69x = 276,020.43
  5. Step 5: Solve for x
    x = 276,020.43/811.69
  6. Step 6: Final answer
    x = 340.06

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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.