Home / 18,917.89-28,376.22-7,821.29

Finding the Fourth Proportional to 18,917.89, 28,376.22 and 7,821.29

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Solution

The fourth proportional to 18,917.89, 28,376.22 and 7,821.29 is: 11,731.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.89 : 28,376.22 = 7,821.29 : x
  2. Step 2: Convert to fraction form
    18,917.89/28,376.22 = 7,821.29/x
  3. Step 3: Cross multiply
    18,917.89x = 28,376.22 × 7,821.29
  4. Step 4: Simplify right side
    18,917.89x = 221,938,745.99
  5. Step 5: Solve for x
    x = 221,938,745.99/18,917.89
  6. Step 6: Final answer
    x = 11,731.69

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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.