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Finding the Fourth Proportional to 18,711.72, 28,043.19 and 7,605.39

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Solution

The fourth proportional to 18,711.72, 28,043.19 and 7,605.39 is: 11,398.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.72 : 28,043.19 = 7,605.39 : x
  2. Step 2: Convert to fraction form
    18,711.72/28,043.19 = 7,605.39/x
  3. Step 3: Cross multiply
    18,711.72x = 28,043.19 × 7,605.39
  4. Step 4: Simplify right side
    18,711.72x = 213,279,396.79
  5. Step 5: Solve for x
    x = 213,279,396.79/18,711.72
  6. Step 6: Final answer
    x = 11,398.17

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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.