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Finding the Fourth Proportional to 18,668.85, 28,002.36 and 6,981.16

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Solution

The fourth proportional to 18,668.85, 28,002.36 and 6,981.16 is: 10,471.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,668.85 : 28,002.36 = 6,981.16 : x
  2. Step 2: Convert to fraction form
    18,668.85/28,002.36 = 6,981.16/x
  3. Step 3: Cross multiply
    18,668.85x = 28,002.36 × 6,981.16
  4. Step 4: Simplify right side
    18,668.85x = 195,488,850.63
  5. Step 5: Solve for x
    x = 195,488,850.63/18,668.85
  6. Step 6: Final answer
    x = 10,471.39

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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.