Home / 20,722.87-31,049.16-12,805.66

Finding the Fourth Proportional to 20,722.87, 31,049.16 and 12,805.66

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Solution

The fourth proportional to 20,722.87, 31,049.16 and 12,805.66 is: 19,186.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,722.87 : 31,049.16 = 12,805.66 : x
  2. Step 2: Convert to fraction form
    20,722.87/31,049.16 = 12,805.66/x
  3. Step 3: Cross multiply
    20,722.87x = 31,049.16 × 12,805.66
  4. Step 4: Simplify right side
    20,722.87x = 397,604,986.25
  5. Step 5: Solve for x
    x = 397,604,986.25/20,722.87
  6. Step 6: Final answer
    x = 19,186.77

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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.