Home / 6,919.78-10,379.61-1,989.40

Finding the Fourth Proportional to 6,919.78, 10,379.61 and 1,989.40

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Solution

The fourth proportional to 6,919.78, 10,379.61 and 1,989.40 is: 2,984.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,919.78 : 10,379.61 = 1,989.40 : x
  2. Step 2: Convert to fraction form
    6,919.78/10,379.61 = 1,989.40/x
  3. Step 3: Cross multiply
    6,919.78x = 10,379.61 × 1,989.40
  4. Step 4: Simplify right side
    6,919.78x = 20,649,196.13
  5. Step 5: Solve for x
    x = 20,649,196.13/6,919.78
  6. Step 6: Final answer
    x = 2,984.08

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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.