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Finding the Fourth Proportional to 1,789.39, 2,683.78 and 815.26

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Solution

The fourth proportional to 1,789.39, 2,683.78 and 815.26 is: 1,222.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,789.39 : 2,683.78 = 815.26 : x
  2. Step 2: Convert to fraction form
    1,789.39/2,683.78 = 815.26/x
  3. Step 3: Cross multiply
    1,789.39x = 2,683.78 × 815.26
  4. Step 4: Simplify right side
    1,789.39x = 2,187,974.41
  5. Step 5: Solve for x
    x = 2,187,974.41/1,789.39
  6. Step 6: Final answer
    x = 1,222.75

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1.5x scale

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.