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Finding the Fourth Proportional to 18,996.30, 28,500.78 and 11,968.20

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Solution

The fourth proportional to 18,996.30, 28,500.78 and 11,968.20 is: 17,956.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,996.30 : 28,500.78 = 11,968.20 : x
  2. Step 2: Convert to fraction form
    18,996.30/28,500.78 = 11,968.20/x
  3. Step 3: Cross multiply
    18,996.30x = 28,500.78 × 11,968.20
  4. Step 4: Simplify right side
    18,996.30x = 341,103,035.20
  5. Step 5: Solve for x
    x = 341,103,035.20/18,996.30
  6. Step 6: Final answer
    x = 17,956.29

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1.5x scale

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.