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Finding the Fourth Proportional to 1,786.80, 2,683.40 and 1,729.20

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Solution

The fourth proportional to 1,786.80, 2,683.40 and 1,729.20 is: 2,596.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.80 : 2,683.40 = 1,729.20 : x
  2. Step 2: Convert to fraction form
    1,786.80/2,683.40 = 1,729.20/x
  3. Step 3: Cross multiply
    1,786.80x = 2,683.40 × 1,729.20
  4. Step 4: Simplify right side
    1,786.80x = 4,640,135.28
  5. Step 5: Solve for x
    x = 4,640,135.28/1,786.80
  6. Step 6: Final answer
    x = 2,596.90

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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.