Home / 21,278.28-31,906.72-12,396.54

Finding the Fourth Proportional to 21,278.28, 31,906.72 and 12,396.54

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Solution

The fourth proportional to 21,278.28, 31,906.72 and 12,396.54 is: 18,588.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.28 : 31,906.72 = 12,396.54 : x
  2. Step 2: Convert to fraction form
    21,278.28/31,906.72 = 12,396.54/x
  3. Step 3: Cross multiply
    21,278.28x = 31,906.72 × 12,396.54
  4. Step 4: Simplify right side
    21,278.28x = 395,532,930.75
  5. Step 5: Solve for x
    x = 395,532,930.75/21,278.28
  6. Step 6: Final answer
    x = 18,588.58

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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.