Home / 6,920.28-10,380.36-1,989.90

Finding the Fourth Proportional to 6,920.28, 10,380.36 and 1,989.90

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Solution

The fourth proportional to 6,920.28, 10,380.36 and 1,989.90 is: 2,984.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,920.28 : 10,380.36 = 1,989.90 : x
  2. Step 2: Convert to fraction form
    6,920.28/10,380.36 = 1,989.90/x
  3. Step 3: Cross multiply
    6,920.28x = 10,380.36 × 1,989.90
  4. Step 4: Simplify right side
    6,920.28x = 20,655,878.36
  5. Step 5: Solve for x
    x = 20,655,878.36/6,920.28
  6. Step 6: Final answer
    x = 2,984.83

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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.