Home / 20,747.43-31,121.01-12,429.81

Finding the Fourth Proportional to 20,747.43, 31,121.01 and 12,429.81

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Solution

The fourth proportional to 20,747.43, 31,121.01 and 12,429.81 is: 18,644.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,747.43 : 31,121.01 = 12,429.81 : x
  2. Step 2: Convert to fraction form
    20,747.43/31,121.01 = 12,429.81/x
  3. Step 3: Cross multiply
    20,747.43x = 31,121.01 × 12,429.81
  4. Step 4: Simplify right side
    20,747.43x = 386,828,241.31
  5. Step 5: Solve for x
    x = 386,828,241.31/20,747.43
  6. Step 6: Final answer
    x = 18,644.63

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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.