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Finding the Fourth Proportional to 20,712, 28,583.28 and 11,759.88

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Solution

The fourth proportional to 20,712, 28,583.28 and 11,759.88 is: 16,229.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712 : 28,583.28 = 11,759.88 : x
  2. Step 2: Convert to fraction form
    20,712/28,583.28 = 11,759.88/x
  3. Step 3: Cross multiply
    20,712x = 28,583.28 × 11,759.88
  4. Step 4: Simplify right side
    20,712x = 336,135,942.81
  5. Step 5: Solve for x
    x = 336,135,942.81/20,712
  6. Step 6: Final answer
    x = 16,229.04

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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.