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Finding the Fourth Proportional to 20,859.83, 28,786.39 and 11,428.39

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Solution

The fourth proportional to 20,859.83, 28,786.39 and 11,428.39 is: 15,771.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.83 : 28,786.39 = 11,428.39 : x
  2. Step 2: Convert to fraction form
    20,859.83/28,786.39 = 11,428.39/x
  3. Step 3: Cross multiply
    20,859.83x = 28,786.39 × 11,428.39
  4. Step 4: Simplify right side
    20,859.83x = 328,982,099.02
  5. Step 5: Solve for x
    x = 328,982,099.02/20,859.83
  6. Step 6: Final answer
    x = 15,771.08

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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.