Home / 6,917.20-10,375.80-1,986.40

Finding the Fourth Proportional to 6,917.20, 10,375.80 and 1,986.40

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Solution

The fourth proportional to 6,917.20, 10,375.80 and 1,986.40 is: 2,979.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,917.20 : 10,375.80 = 1,986.40 : x
  2. Step 2: Convert to fraction form
    6,917.20/10,375.80 = 1,986.40/x
  3. Step 3: Cross multiply
    6,917.20x = 10,375.80 × 1,986.40
  4. Step 4: Simplify right side
    6,917.20x = 20,610,489.12
  5. Step 5: Solve for x
    x = 20,610,489.12/6,917.20
  6. Step 6: Final answer
    x = 2,979.60

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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.