Home / 3,151.40-4,728.90-2,178.20

Finding the Fourth Proportional to 3,151.40, 4,728.90 and 2,178.20

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Solution

The fourth proportional to 3,151.40, 4,728.90 and 2,178.20 is: 3,268.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,151.40 : 4,728.90 = 2,178.20 : x
  2. Step 2: Convert to fraction form
    3,151.40/4,728.90 = 2,178.20/x
  3. Step 3: Cross multiply
    3,151.40x = 4,728.90 × 2,178.20
  4. Step 4: Simplify right side
    3,151.40x = 10,300,489.98
  5. Step 5: Solve for x
    x = 10,300,489.98/3,151.40
  6. Step 6: Final answer
    x = 3,268.54

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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.