Home / 21,811.92-30,103.56-15,781.74

Finding the Fourth Proportional to 21,811.92, 30,103.56 and 15,781.74

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Solution

The fourth proportional to 21,811.92, 30,103.56 and 15,781.74 is: 21,781.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,811.92 : 30,103.56 = 15,781.74 : x
  2. Step 2: Convert to fraction form
    21,811.92/30,103.56 = 15,781.74/x
  3. Step 3: Cross multiply
    21,811.92x = 30,103.56 × 15,781.74
  4. Step 4: Simplify right side
    21,811.92x = 475,086,556.99
  5. Step 5: Solve for x
    x = 475,086,556.99/21,811.92
  6. Step 6: Final answer
    x = 21,781.05

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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.