Home / 3,947.75-5,920.91-1,315

Finding the Fourth Proportional to 3,947.75, 5,920.91 and 1,315

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Solution

The fourth proportional to 3,947.75, 5,920.91 and 1,315 is: 1,972.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.75 : 5,920.91 = 1,315 : x
  2. Step 2: Convert to fraction form
    3,947.75/5,920.91 = 1,315/x
  3. Step 3: Cross multiply
    3,947.75x = 5,920.91 × 1,315
  4. Step 4: Simplify right side
    3,947.75x = 7,785,996.65
  5. Step 5: Solve for x
    x = 7,785,996.65/3,947.75
  6. Step 6: Final answer
    x = 1,972.26

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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.