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Finding the Fourth Proportional to 18,869.20, 28,242.20 and 13,008.08

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Solution

The fourth proportional to 18,869.20, 28,242.20 and 13,008.08 is: 19,469.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,869.20 : 28,242.20 = 13,008.08 : x
  2. Step 2: Convert to fraction form
    18,869.20/28,242.20 = 13,008.08/x
  3. Step 3: Cross multiply
    18,869.20x = 28,242.20 × 13,008.08
  4. Step 4: Simplify right side
    18,869.20x = 367,376,796.98
  5. Step 5: Solve for x
    x = 367,376,796.98/18,869.20
  6. Step 6: Final answer
    x = 19,469.65

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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.