Home / 2,275.20-3,139.11-1,390.41

Finding the Fourth Proportional to 2,275.20, 3,139.11 and 1,390.41

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Solution

The fourth proportional to 2,275.20, 3,139.11 and 1,390.41 is: 1,918.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.20 : 3,139.11 = 1,390.41 : x
  2. Step 2: Convert to fraction form
    2,275.20/3,139.11 = 1,390.41/x
  3. Step 3: Cross multiply
    2,275.20x = 3,139.11 × 1,390.41
  4. Step 4: Simplify right side
    2,275.20x = 4,364,649.94
  5. Step 5: Solve for x
    x = 4,364,649.94/2,275.20
  6. Step 6: Final answer
    x = 1,918.36

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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.