Home / 20,821.52-28,732.98-11,871.90

Finding the Fourth Proportional to 20,821.52, 28,732.98 and 11,871.90

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Solution

The fourth proportional to 20,821.52, 28,732.98 and 11,871.90 is: 16,382.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.52 : 28,732.98 = 11,871.90 : x
  2. Step 2: Convert to fraction form
    20,821.52/28,732.98 = 11,871.90/x
  3. Step 3: Cross multiply
    20,821.52x = 28,732.98 × 11,871.90
  4. Step 4: Simplify right side
    20,821.52x = 341,115,065.26
  5. Step 5: Solve for x
    x = 341,115,065.26/20,821.52
  6. Step 6: Final answer
    x = 16,382.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.