Home / 20,872.13-31,310.01-5,289.75

Finding the Fourth Proportional to 20,872.13, 31,310.01 and 5,289.75

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Solution

The fourth proportional to 20,872.13, 31,310.01 and 5,289.75 is: 7,935.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.13 : 31,310.01 = 5,289.75 : x
  2. Step 2: Convert to fraction form
    20,872.13/31,310.01 = 5,289.75/x
  3. Step 3: Cross multiply
    20,872.13x = 31,310.01 × 5,289.75
  4. Step 4: Simplify right side
    20,872.13x = 165,622,125.40
  5. Step 5: Solve for x
    x = 165,622,125.40/20,872.13
  6. Step 6: Final answer
    x = 7,935.09

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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.