Home / 20,872.81-31,313.32-7,725.30

Finding the Fourth Proportional to 20,872.81, 31,313.32 and 7,725.30

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Solution

The fourth proportional to 20,872.81, 31,313.32 and 7,725.30 is: 11,589.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.81 : 31,313.32 = 7,725.30 : x
  2. Step 2: Convert to fraction form
    20,872.81/31,313.32 = 7,725.30/x
  3. Step 3: Cross multiply
    20,872.81x = 31,313.32 × 7,725.30
  4. Step 4: Simplify right side
    20,872.81x = 241,904,654.26
  5. Step 5: Solve for x
    x = 241,904,654.26/20,872.81
  6. Step 6: Final answer
    x = 11,589.46

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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.