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Finding the Fourth Proportional to 20,876.90, 28,806.99 and 11,922.51

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Solution

The fourth proportional to 20,876.90, 28,806.99 and 11,922.51 is: 16,451.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.90 : 28,806.99 = 11,922.51 : x
  2. Step 2: Convert to fraction form
    20,876.90/28,806.99 = 11,922.51/x
  3. Step 3: Cross multiply
    20,876.90x = 28,806.99 × 11,922.51
  4. Step 4: Simplify right side
    20,876.90x = 343,451,626.34
  5. Step 5: Solve for x
    x = 343,451,626.34/20,876.90
  6. Step 6: Final answer
    x = 16,451.28

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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.