Home / 3,100.40-4,278.43-1,921.45

Finding the Fourth Proportional to 3,100.40, 4,278.43 and 1,921.45

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Solution

The fourth proportional to 3,100.40, 4,278.43 and 1,921.45 is: 2,651.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,100.40 : 4,278.43 = 1,921.45 : x
  2. Step 2: Convert to fraction form
    3,100.40/4,278.43 = 1,921.45/x
  3. Step 3: Cross multiply
    3,100.40x = 4,278.43 × 1,921.45
  4. Step 4: Simplify right side
    3,100.40x = 8,220,789.32
  5. Step 5: Solve for x
    x = 8,220,789.32/3,100.40
  6. Step 6: Final answer
    x = 2,651.53

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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.