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Finding the Fourth Proportional to 1,609.78, 2,221.57 and 911.16

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Solution

The fourth proportional to 1,609.78, 2,221.57 and 911.16 is: 1,257.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.78 : 2,221.57 = 911.16 : x
  2. Step 2: Convert to fraction form
    1,609.78/2,221.57 = 911.16/x
  3. Step 3: Cross multiply
    1,609.78x = 2,221.57 × 911.16
  4. Step 4: Simplify right side
    1,609.78x = 2,024,195.11
  5. Step 5: Solve for x
    x = 2,024,195.11/1,609.78
  6. Step 6: Final answer
    x = 1,257.43

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1.5x scale

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.