Home / 2,275.28-3,139.92-1,391.57

Finding the Fourth Proportional to 2,275.28, 3,139.92 and 1,391.57

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Solution

The fourth proportional to 2,275.28, 3,139.92 and 1,391.57 is: 1,920.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.28 : 3,139.92 = 1,391.57 : x
  2. Step 2: Convert to fraction form
    2,275.28/3,139.92 = 1,391.57/x
  3. Step 3: Cross multiply
    2,275.28x = 3,139.92 × 1,391.57
  4. Step 4: Simplify right side
    2,275.28x = 4,369,402.77
  5. Step 5: Solve for x
    x = 4,369,402.77/2,275.28
  6. Step 6: Final answer
    x = 1,920.38

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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.