Home / 3,941.21-5,438.79-2,172.78

Finding the Fourth Proportional to 3,941.21, 5,438.79 and 2,172.78

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Solution

The fourth proportional to 3,941.21, 5,438.79 and 2,172.78 is: 2,998.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,941.21 : 5,438.79 = 2,172.78 : x
  2. Step 2: Convert to fraction form
    3,941.21/5,438.79 = 2,172.78/x
  3. Step 3: Cross multiply
    3,941.21x = 5,438.79 × 2,172.78
  4. Step 4: Simplify right side
    3,941.21x = 11,817,294.14
  5. Step 5: Solve for x
    x = 11,817,294.14/3,941.21
  6. Step 6: Final answer
    x = 2,998.40

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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.