Home / 2,275.36-3,140-1,280.80

Finding the Fourth Proportional to 2,275.36, 3,140 and 1,280.80

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Solution

The fourth proportional to 2,275.36, 3,140 and 1,280.80 is: 1,767.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.36 : 3,140 = 1,280.80 : x
  2. Step 2: Convert to fraction form
    2,275.36/3,140 = 1,280.80/x
  3. Step 3: Cross multiply
    2,275.36x = 3,140 × 1,280.80
  4. Step 4: Simplify right side
    2,275.36x = 4,021,712
  5. Step 5: Solve for x
    x = 4,021,712/2,275.36
  6. Step 6: Final answer
    x = 1,767.51

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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.