Home / 2,120.16-3,181.38-821.64

Finding the Fourth Proportional to 2,120.16, 3,181.38 and 821.64

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Solution

The fourth proportional to 2,120.16, 3,181.38 and 821.64 is: 1,232.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.16 : 3,181.38 = 821.64 : x
  2. Step 2: Convert to fraction form
    2,120.16/3,181.38 = 821.64/x
  3. Step 3: Cross multiply
    2,120.16x = 3,181.38 × 821.64
  4. Step 4: Simplify right side
    2,120.16x = 2,613,949.06
  5. Step 5: Solve for x
    x = 2,613,949.06/2,120.16
  6. Step 6: Final answer
    x = 1,232.90

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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.