Home / 8,078.40-12,120.71-3,151.53

Finding the Fourth Proportional to 8,078.40, 12,120.71 and 3,151.53

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Solution

The fourth proportional to 8,078.40, 12,120.71 and 3,151.53 is: 4,728.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,078.40 : 12,120.71 = 3,151.53 : x
  2. Step 2: Convert to fraction form
    8,078.40/12,120.71 = 3,151.53/x
  3. Step 3: Cross multiply
    8,078.40x = 12,120.71 × 3,151.53
  4. Step 4: Simplify right side
    8,078.40x = 38,198,765.43
  5. Step 5: Solve for x
    x = 38,198,765.43/8,078.40
  6. Step 6: Final answer
    x = 4,728.51

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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.