Home / 3,921-5,409.06-2,857.12

Finding the Fourth Proportional to 3,921, 5,409.06 and 2,857.12

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Solution

The fourth proportional to 3,921, 5,409.06 and 2,857.12 is: 3,941.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921 : 5,409.06 = 2,857.12 : x
  2. Step 2: Convert to fraction form
    3,921/5,409.06 = 2,857.12/x
  3. Step 3: Cross multiply
    3,921x = 5,409.06 × 2,857.12
  4. Step 4: Simplify right side
    3,921x = 15,454,333.51
  5. Step 5: Solve for x
    x = 15,454,333.51/3,921
  6. Step 6: Final answer
    x = 3,941.43

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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.