Home / 2,121.10-3,182.10-640.20

Finding the Fourth Proportional to 2,121.10, 3,182.10 and 640.20

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Solution

The fourth proportional to 2,121.10, 3,182.10 and 640.20 is: 960.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.10 : 3,182.10 = 640.20 : x
  2. Step 2: Convert to fraction form
    2,121.10/3,182.10 = 640.20/x
  3. Step 3: Cross multiply
    2,121.10x = 3,182.10 × 640.20
  4. Step 4: Simplify right side
    2,121.10x = 2,037,180.42
  5. Step 5: Solve for x
    x = 2,037,180.42/2,121.10
  6. Step 6: Final answer
    x = 960.44

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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.