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Finding the Fourth Proportional to 15,344.62, 21,175.46 and 8,720.62

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Solution

The fourth proportional to 15,344.62, 21,175.46 and 8,720.62 is: 12,034.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,344.62 : 21,175.46 = 8,720.62 : x
  2. Step 2: Convert to fraction form
    15,344.62/21,175.46 = 8,720.62/x
  3. Step 3: Cross multiply
    15,344.62x = 21,175.46 × 8,720.62
  4. Step 4: Simplify right side
    15,344.62x = 184,663,139.99
  5. Step 5: Solve for x
    x = 184,663,139.99/15,344.62
  6. Step 6: Final answer
    x = 12,034.39

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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.