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Finding the Fourth Proportional to 18,865.70, 28,287.72 and 14,589.90

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Solution

The fourth proportional to 18,865.70, 28,287.72 and 14,589.90 is: 21,876.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,865.70 : 28,287.72 = 14,589.90 : x
  2. Step 2: Convert to fraction form
    18,865.70/28,287.72 = 14,589.90/x
  3. Step 3: Cross multiply
    18,865.70x = 28,287.72 × 14,589.90
  4. Step 4: Simplify right side
    18,865.70x = 412,715,006.03
  5. Step 5: Solve for x
    x = 412,715,006.03/18,865.70
  6. Step 6: Final answer
    x = 21,876.48

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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.