Home / 2,107.60-3,163.20-939.40

Finding the Fourth Proportional to 2,107.60, 3,163.20 and 939.40

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Solution

The fourth proportional to 2,107.60, 3,163.20 and 939.40 is: 1,409.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,107.60 : 3,163.20 = 939.40 : x
  2. Step 2: Convert to fraction form
    2,107.60/3,163.20 = 939.40/x
  3. Step 3: Cross multiply
    2,107.60x = 3,163.20 × 939.40
  4. Step 4: Simplify right side
    2,107.60x = 2,971,510.08
  5. Step 5: Solve for x
    x = 2,971,510.08/2,107.60
  6. Step 6: Final answer
    x = 1,409.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.