Home / 6,921.22-10,380.43-1,989.70

Finding the Fourth Proportional to 6,921.22, 10,380.43 and 1,989.70

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Solution

The fourth proportional to 6,921.22, 10,380.43 and 1,989.70 is: 2,984.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,921.22 : 10,380.43 = 1,989.70 : x
  2. Step 2: Convert to fraction form
    6,921.22/10,380.43 = 1,989.70/x
  3. Step 3: Cross multiply
    6,921.22x = 10,380.43 × 1,989.70
  4. Step 4: Simplify right side
    6,921.22x = 20,653,941.57
  5. Step 5: Solve for x
    x = 20,653,941.57/6,921.22
  6. Step 6: Final answer
    x = 2,984.15

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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.