Home / 13,821.54-20,715.90-7,966.05

Finding the Fourth Proportional to 13,821.54, 20,715.90 and 7,966.05

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Solution

The fourth proportional to 13,821.54, 20,715.90 and 7,966.05 is: 11,939.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,821.54 : 20,715.90 = 7,966.05 : x
  2. Step 2: Convert to fraction form
    13,821.54/20,715.90 = 7,966.05/x
  3. Step 3: Cross multiply
    13,821.54x = 20,715.90 × 7,966.05
  4. Step 4: Simplify right side
    13,821.54x = 165,023,832.45
  5. Step 5: Solve for x
    x = 165,023,832.45/13,821.54
  6. Step 6: Final answer
    x = 11,939.62

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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.