Home / 21,172.82-31,754.60-8,680.55

Finding the Fourth Proportional to 21,172.82, 31,754.60 and 8,680.55

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Solution

The fourth proportional to 21,172.82, 31,754.60 and 8,680.55 is: 13,018.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,172.82 : 31,754.60 = 8,680.55 : x
  2. Step 2: Convert to fraction form
    21,172.82/31,754.60 = 8,680.55/x
  3. Step 3: Cross multiply
    21,172.82x = 31,754.60 × 8,680.55
  4. Step 4: Simplify right side
    21,172.82x = 275,647,349.63
  5. Step 5: Solve for x
    x = 275,647,349.63/21,172.82
  6. Step 6: Final answer
    x = 13,018.92

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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.