Home / 2,920.57-4,378.40-1,275.86

Finding the Fourth Proportional to 2,920.57, 4,378.40 and 1,275.86

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Solution

The fourth proportional to 2,920.57, 4,378.40 and 1,275.86 is: 1,912.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.57 : 4,378.40 = 1,275.86 : x
  2. Step 2: Convert to fraction form
    2,920.57/4,378.40 = 1,275.86/x
  3. Step 3: Cross multiply
    2,920.57x = 4,378.40 × 1,275.86
  4. Step 4: Simplify right side
    2,920.57x = 5,586,234.78
  5. Step 5: Solve for x
    x = 5,586,234.78/2,920.57
  6. Step 6: Final answer
    x = 1,912.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.