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Finding the Fourth Proportional to 20,892.90, 28,830.09 and 11,819.25

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Solution

The fourth proportional to 20,892.90, 28,830.09 and 11,819.25 is: 16,309.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,892.90 : 28,830.09 = 11,819.25 : x
  2. Step 2: Convert to fraction form
    20,892.90/28,830.09 = 11,819.25/x
  3. Step 3: Cross multiply
    20,892.90x = 28,830.09 × 11,819.25
  4. Step 4: Simplify right side
    20,892.90x = 340,750,041.23
  5. Step 5: Solve for x
    x = 340,750,041.23/20,892.90
  6. Step 6: Final answer
    x = 16,309.37

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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.