Home / 2,138.60-3,207.90-2,126.45

Finding the Fourth Proportional to 2,138.60, 3,207.90 and 2,126.45

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Solution

The fourth proportional to 2,138.60, 3,207.90 and 2,126.45 is: 3,189.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.60 : 3,207.90 = 2,126.45 : x
  2. Step 2: Convert to fraction form
    2,138.60/3,207.90 = 2,126.45/x
  3. Step 3: Cross multiply
    2,138.60x = 3,207.90 × 2,126.45
  4. Step 4: Simplify right side
    2,138.60x = 6,821,438.96
  5. Step 5: Solve for x
    x = 6,821,438.96/2,138.60
  6. Step 6: Final answer
    x = 3,189.68

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1.5x scale

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.