Home / 2,275.40-3,139.99-1,391.20

Finding the Fourth Proportional to 2,275.40, 3,139.99 and 1,391.20

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Solution

The fourth proportional to 2,275.40, 3,139.99 and 1,391.20 is: 1,919.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.40 : 3,139.99 = 1,391.20 : x
  2. Step 2: Convert to fraction form
    2,275.40/3,139.99 = 1,391.20/x
  3. Step 3: Cross multiply
    2,275.40x = 3,139.99 × 1,391.20
  4. Step 4: Simplify right side
    2,275.40x = 4,368,354.09
  5. Step 5: Solve for x
    x = 4,368,354.09/2,275.40
  6. Step 6: Final answer
    x = 1,919.82

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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.