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Finding the Fourth Proportional to 1,609.91, 2,221.61 and 911.28

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Solution

The fourth proportional to 1,609.91, 2,221.61 and 911.28 is: 1,257.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.91 : 2,221.61 = 911.28 : x
  2. Step 2: Convert to fraction form
    1,609.91/2,221.61 = 911.28/x
  3. Step 3: Cross multiply
    1,609.91x = 2,221.61 × 911.28
  4. Step 4: Simplify right side
    1,609.91x = 2,024,517.66
  5. Step 5: Solve for x
    x = 2,024,517.66/1,609.91
  6. Step 6: Final answer
    x = 1,257.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.