Home / 21,167.78-31,723.82-11,812.20

Finding the Fourth Proportional to 21,167.78, 31,723.82 and 11,812.20

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Solution

The fourth proportional to 21,167.78, 31,723.82 and 11,812.20 is: 17,702.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,167.78 : 31,723.82 = 11,812.20 : x
  2. Step 2: Convert to fraction form
    21,167.78/31,723.82 = 11,812.20/x
  3. Step 3: Cross multiply
    21,167.78x = 31,723.82 × 11,812.20
  4. Step 4: Simplify right side
    21,167.78x = 374,728,047.54
  5. Step 5: Solve for x
    x = 374,728,047.54/21,167.78
  6. Step 6: Final answer
    x = 17,702.76

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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.