Home / 2,120.39-3,181.12-659.55

Finding the Fourth Proportional to 2,120.39, 3,181.12 and 659.55

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Solution

The fourth proportional to 2,120.39, 3,181.12 and 659.55 is: 989.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.39 : 3,181.12 = 659.55 : x
  2. Step 2: Convert to fraction form
    2,120.39/3,181.12 = 659.55/x
  3. Step 3: Cross multiply
    2,120.39x = 3,181.12 × 659.55
  4. Step 4: Simplify right side
    2,120.39x = 2,098,106.05
  5. Step 5: Solve for x
    x = 2,098,106.05/2,120.39
  6. Step 6: Final answer
    x = 989.49

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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.