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Finding the Fourth Proportional to 18,981.03, 28,442.39 and 7,287.87

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Solution

The fourth proportional to 18,981.03, 28,442.39 and 7,287.87 is: 10,920.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,981.03 : 28,442.39 = 7,287.87 : x
  2. Step 2: Convert to fraction form
    18,981.03/28,442.39 = 7,287.87/x
  3. Step 3: Cross multiply
    18,981.03x = 28,442.39 × 7,287.87
  4. Step 4: Simplify right side
    18,981.03x = 207,284,552.02
  5. Step 5: Solve for x
    x = 207,284,552.02/18,981.03
  6. Step 6: Final answer
    x = 10,920.61

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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.