Home / 2,275.31-3,139.89-1,280.60

Finding the Fourth Proportional to 2,275.31, 3,139.89 and 1,280.60

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Solution

The fourth proportional to 2,275.31, 3,139.89 and 1,280.60 is: 1,767.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.31 : 3,139.89 = 1,280.60 : x
  2. Step 2: Convert to fraction form
    2,275.31/3,139.89 = 1,280.60/x
  3. Step 3: Cross multiply
    2,275.31x = 3,139.89 × 1,280.60
  4. Step 4: Simplify right side
    2,275.31x = 4,020,927.43
  5. Step 5: Solve for x
    x = 4,020,927.43/2,275.31
  6. Step 6: Final answer
    x = 1,767.20

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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.