Home / 7,981.74-11,971.44-2,138.76

Finding the Fourth Proportional to 7,981.74, 11,971.44 and 2,138.76

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Solution

The fourth proportional to 7,981.74, 11,971.44 and 2,138.76 is: 3,207.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,981.74 : 11,971.44 = 2,138.76 : x
  2. Step 2: Convert to fraction form
    7,981.74/11,971.44 = 2,138.76/x
  3. Step 3: Cross multiply
    7,981.74x = 11,971.44 × 2,138.76
  4. Step 4: Simplify right side
    7,981.74x = 25,604,037.01
  5. Step 5: Solve for x
    x = 25,604,037.01/7,981.74
  6. Step 6: Final answer
    x = 3,207.83

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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.