Home / 6,986.78-9,639.40-3,961.57

Finding the Fourth Proportional to 6,986.78, 9,639.40 and 3,961.57

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Solution

The fourth proportional to 6,986.78, 9,639.40 and 3,961.57 is: 5,465.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,986.78 : 9,639.40 = 3,961.57 : x
  2. Step 2: Convert to fraction form
    6,986.78/9,639.40 = 3,961.57/x
  3. Step 3: Cross multiply
    6,986.78x = 9,639.40 × 3,961.57
  4. Step 4: Simplify right side
    6,986.78x = 38,187,157.86
  5. Step 5: Solve for x
    x = 38,187,157.86/6,986.78
  6. Step 6: Final answer
    x = 5,465.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.