Home / 3,278.40-4,917.90-1,330.20

Finding the Fourth Proportional to 3,278.40, 4,917.90 and 1,330.20

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Solution

The fourth proportional to 3,278.40, 4,917.90 and 1,330.20 is: 1,995.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,278.40 : 4,917.90 = 1,330.20 : x
  2. Step 2: Convert to fraction form
    3,278.40/4,917.90 = 1,330.20/x
  3. Step 3: Cross multiply
    3,278.40x = 4,917.90 × 1,330.20
  4. Step 4: Simplify right side
    3,278.40x = 6,541,790.58
  5. Step 5: Solve for x
    x = 6,541,790.58/3,278.40
  6. Step 6: Final answer
    x = 1,995.42

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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.