Home / 3,138.80-4,331.32-1,812.24

Finding the Fourth Proportional to 3,138.80, 4,331.32 and 1,812.24

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Solution

The fourth proportional to 3,138.80, 4,331.32 and 1,812.24 is: 2,500.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.80 : 4,331.32 = 1,812.24 : x
  2. Step 2: Convert to fraction form
    3,138.80/4,331.32 = 1,812.24/x
  3. Step 3: Cross multiply
    3,138.80x = 4,331.32 × 1,812.24
  4. Step 4: Simplify right side
    3,138.80x = 7,849,391.36
  5. Step 5: Solve for x
    x = 7,849,391.36/3,138.80
  6. Step 6: Final answer
    x = 2,500.76

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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.