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Finding the Fourth Proportional to 20,922, 28,872.08 and 11,490.40

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Solution

The fourth proportional to 20,922, 28,872.08 and 11,490.40 is: 15,856.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,922 : 28,872.08 = 11,490.40 : x
  2. Step 2: Convert to fraction form
    20,922/28,872.08 = 11,490.40/x
  3. Step 3: Cross multiply
    20,922x = 28,872.08 × 11,490.40
  4. Step 4: Simplify right side
    20,922x = 331,751,748.03
  5. Step 5: Solve for x
    x = 331,751,748.03/20,922
  6. Step 6: Final answer
    x = 15,856.60

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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.