Home / 21,115.72-31,676.82-7,967.80

Finding the Fourth Proportional to 21,115.72, 31,676.82 and 7,967.80

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Solution

The fourth proportional to 21,115.72, 31,676.82 and 7,967.80 is: 11,952.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.72 : 31,676.82 = 7,967.80 : x
  2. Step 2: Convert to fraction form
    21,115.72/31,676.82 = 7,967.80/x
  3. Step 3: Cross multiply
    21,115.72x = 31,676.82 × 7,967.80
  4. Step 4: Simplify right side
    21,115.72x = 252,394,566.40
  5. Step 5: Solve for x
    x = 252,394,566.40/21,115.72
  6. Step 6: Final answer
    x = 11,952.92

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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.