Home / 21,122.72-31,645.20-18,789.92

Finding the Fourth Proportional to 21,122.72, 31,645.20 and 18,789.92

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Solution

The fourth proportional to 21,122.72, 31,645.20 and 18,789.92 is: 28,150.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,122.72 : 31,645.20 = 18,789.92 : x
  2. Step 2: Convert to fraction form
    21,122.72/31,645.20 = 18,789.92/x
  3. Step 3: Cross multiply
    21,122.72x = 31,645.20 × 18,789.92
  4. Step 4: Simplify right side
    21,122.72x = 594,610,776.38
  5. Step 5: Solve for x
    x = 594,610,776.38/21,122.72
  6. Step 6: Final answer
    x = 28,150.29

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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.