Home / 3,971.11-5,486.71-3,138.20

Finding the Fourth Proportional to 3,971.11, 5,486.71 and 3,138.20

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Solution

The fourth proportional to 3,971.11, 5,486.71 and 3,138.20 is: 4,335.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,971.11 : 5,486.71 = 3,138.20 : x
  2. Step 2: Convert to fraction form
    3,971.11/5,486.71 = 3,138.20/x
  3. Step 3: Cross multiply
    3,971.11x = 5,486.71 × 3,138.20
  4. Step 4: Simplify right side
    3,971.11x = 17,218,393.32
  5. Step 5: Solve for x
    x = 17,218,393.32/3,971.11
  6. Step 6: Final answer
    x = 4,335.91

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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.