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Finding the Fourth Proportional to 20,459.52, 30,684.72 and 7,979.88

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Solution

The fourth proportional to 20,459.52, 30,684.72 and 7,979.88 is: 11,968.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,459.52 : 30,684.72 = 7,979.88 : x
  2. Step 2: Convert to fraction form
    20,459.52/30,684.72 = 7,979.88/x
  3. Step 3: Cross multiply
    20,459.52x = 30,684.72 × 7,979.88
  4. Step 4: Simplify right side
    20,459.52x = 244,860,383.43
  5. Step 5: Solve for x
    x = 244,860,383.43/20,459.52
  6. Step 6: Final answer
    x = 11,968.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.