Home / 2,275.68-3,140.14-1,280.80

Finding the Fourth Proportional to 2,275.68, 3,140.14 and 1,280.80

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Solution

The fourth proportional to 2,275.68, 3,140.14 and 1,280.80 is: 1,767.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.68 : 3,140.14 = 1,280.80 : x
  2. Step 2: Convert to fraction form
    2,275.68/3,140.14 = 1,280.80/x
  3. Step 3: Cross multiply
    2,275.68x = 3,140.14 × 1,280.80
  4. Step 4: Simplify right side
    2,275.68x = 4,021,891.31
  5. Step 5: Solve for x
    x = 4,021,891.31/2,275.68
  6. Step 6: Final answer
    x = 1,767.34

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Double scale
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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.