Home / 2,275.30-3,139.73-1,280.75

Finding the Fourth Proportional to 2,275.30, 3,139.73 and 1,280.75

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Solution

The fourth proportional to 2,275.30, 3,139.73 and 1,280.75 is: 1,767.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.30 : 3,139.73 = 1,280.75 : x
  2. Step 2: Convert to fraction form
    2,275.30/3,139.73 = 1,280.75/x
  3. Step 3: Cross multiply
    2,275.30x = 3,139.73 × 1,280.75
  4. Step 4: Simplify right side
    2,275.30x = 4,021,209.20
  5. Step 5: Solve for x
    x = 4,021,209.20/2,275.30
  6. Step 6: Final answer
    x = 1,767.33

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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.