Home / 21,018.66-31,499.19-20,387.94

Finding the Fourth Proportional to 21,018.66, 31,499.19 and 20,387.94

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Solution

The fourth proportional to 21,018.66, 31,499.19 and 20,387.94 is: 30,553.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018.66 : 31,499.19 = 20,387.94 : x
  2. Step 2: Convert to fraction form
    21,018.66/31,499.19 = 20,387.94/x
  3. Step 3: Cross multiply
    21,018.66x = 31,499.19 × 20,387.94
  4. Step 4: Simplify right side
    21,018.66x = 642,203,595.77
  5. Step 5: Solve for x
    x = 642,203,595.77/21,018.66
  6. Step 6: Final answer
    x = 30,553.97

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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.