Home / 20,872.29-31,305.11-7,721.67

Finding the Fourth Proportional to 20,872.29, 31,305.11 and 7,721.67

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Solution

The fourth proportional to 20,872.29, 31,305.11 and 7,721.67 is: 11,581.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.29 : 31,305.11 = 7,721.67 : x
  2. Step 2: Convert to fraction form
    20,872.29/31,305.11 = 7,721.67/x
  3. Step 3: Cross multiply
    20,872.29x = 31,305.11 × 7,721.67
  4. Step 4: Simplify right side
    20,872.29x = 241,727,690.13
  5. Step 5: Solve for x
    x = 241,727,690.13/20,872.29
  6. Step 6: Final answer
    x = 11,581.27

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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.