Home / 2,275.48-3,140.10-1,280.80

Finding the Fourth Proportional to 2,275.48, 3,140.10 and 1,280.80

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Solution

The fourth proportional to 2,275.48, 3,140.10 and 1,280.80 is: 1,767.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.48 : 3,140.10 = 1,280.80 : x
  2. Step 2: Convert to fraction form
    2,275.48/3,140.10 = 1,280.80/x
  3. Step 3: Cross multiply
    2,275.48x = 3,140.10 × 1,280.80
  4. Step 4: Simplify right side
    2,275.48x = 4,021,840.08
  5. Step 5: Solve for x
    x = 4,021,840.08/2,275.48
  6. Step 6: Final answer
    x = 1,767.47

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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.