Home / 2,874.78-3,960.81-1,989.36

Finding the Fourth Proportional to 2,874.78, 3,960.81 and 1,989.36

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Solution

The fourth proportional to 2,874.78, 3,960.81 and 1,989.36 is: 2,740.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,874.78 : 3,960.81 = 1,989.36 : x
  2. Step 2: Convert to fraction form
    2,874.78/3,960.81 = 1,989.36/x
  3. Step 3: Cross multiply
    2,874.78x = 3,960.81 × 1,989.36
  4. Step 4: Simplify right side
    2,874.78x = 7,879,476.98
  5. Step 5: Solve for x
    x = 7,879,476.98/2,874.78
  6. Step 6: Final answer
    x = 2,740.90

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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.