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Finding the Fourth Proportional to 18,636.72, 25,720.56 and 10,680

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Solution

The fourth proportional to 18,636.72, 25,720.56 and 10,680 is: 14,739.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,636.72 : 25,720.56 = 10,680 : x
  2. Step 2: Convert to fraction form
    18,636.72/25,720.56 = 10,680/x
  3. Step 3: Cross multiply
    18,636.72x = 25,720.56 × 10,680
  4. Step 4: Simplify right side
    18,636.72x = 274,695,580.80
  5. Step 5: Solve for x
    x = 274,695,580.80/18,636.72
  6. Step 6: Final answer
    x = 14,739.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.