Home / 2,121.11-3,181.59-640.34

Finding the Fourth Proportional to 2,121.11, 3,181.59 and 640.34

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Solution

The fourth proportional to 2,121.11, 3,181.59 and 640.34 is: 960.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.11 : 3,181.59 = 640.34 : x
  2. Step 2: Convert to fraction form
    2,121.11/3,181.59 = 640.34/x
  3. Step 3: Cross multiply
    2,121.11x = 3,181.59 × 640.34
  4. Step 4: Simplify right side
    2,121.11x = 2,037,283.43
  5. Step 5: Solve for x
    x = 2,037,283.43/2,121.11
  6. Step 6: Final answer
    x = 960.48

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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.