Home / 20,811.90-28,717.20-11,859.78

Finding the Fourth Proportional to 20,811.90, 28,717.20 and 11,859.78

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Solution

The fourth proportional to 20,811.90, 28,717.20 and 11,859.78 is: 16,364.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.90 : 28,717.20 = 11,859.78 : x
  2. Step 2: Convert to fraction form
    20,811.90/28,717.20 = 11,859.78/x
  3. Step 3: Cross multiply
    20,811.90x = 28,717.20 × 11,859.78
  4. Step 4: Simplify right side
    20,811.90x = 340,579,674.22
  5. Step 5: Solve for x
    x = 340,579,674.22/20,811.90
  6. Step 6: Final answer
    x = 16,364.66

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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.