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Finding the Fourth Proportional to 2,149.40, 3,224.24 and 689.60

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Solution

The fourth proportional to 2,149.40, 3,224.24 and 689.60 is: 1,034.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,149.40 : 3,224.24 = 689.60 : x
  2. Step 2: Convert to fraction form
    2,149.40/3,224.24 = 689.60/x
  3. Step 3: Cross multiply
    2,149.40x = 3,224.24 × 689.60
  4. Step 4: Simplify right side
    2,149.40x = 2,223,435.90
  5. Step 5: Solve for x
    x = 2,223,435.90/2,149.40
  6. Step 6: Final answer
    x = 1,034.44

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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.