Home / 20,738.57-31,107.85-5,156.20

Finding the Fourth Proportional to 20,738.57, 31,107.85 and 5,156.20

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Solution

The fourth proportional to 20,738.57, 31,107.85 and 5,156.20 is: 7,734.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,738.57 : 31,107.85 = 5,156.20 : x
  2. Step 2: Convert to fraction form
    20,738.57/31,107.85 = 5,156.20/x
  3. Step 3: Cross multiply
    20,738.57x = 31,107.85 × 5,156.20
  4. Step 4: Simplify right side
    20,738.57x = 160,398,147.18
  5. Step 5: Solve for x
    x = 160,398,147.18/20,738.57
  6. Step 6: Final answer
    x = 7,734.29

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1.5x scale

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.