Home / 6,919.42-10,380.96-1,989.40

Finding the Fourth Proportional to 6,919.42, 10,380.96 and 1,989.40

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Solution

The fourth proportional to 6,919.42, 10,380.96 and 1,989.40 is: 2,984.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,919.42 : 10,380.96 = 1,989.40 : x
  2. Step 2: Convert to fraction form
    6,919.42/10,380.96 = 1,989.40/x
  3. Step 3: Cross multiply
    6,919.42x = 10,380.96 × 1,989.40
  4. Step 4: Simplify right side
    6,919.42x = 20,651,881.82
  5. Step 5: Solve for x
    x = 20,651,881.82/6,919.42
  6. Step 6: Final answer
    x = 2,984.63

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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.