Home / 20,553.12-28,363.37-11,121.71

Finding the Fourth Proportional to 20,553.12, 28,363.37 and 11,121.71

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Solution

The fourth proportional to 20,553.12, 28,363.37 and 11,121.71 is: 15,347.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,553.12 : 28,363.37 = 11,121.71 : x
  2. Step 2: Convert to fraction form
    20,553.12/28,363.37 = 11,121.71/x
  3. Step 3: Cross multiply
    20,553.12x = 28,363.37 × 11,121.71
  4. Step 4: Simplify right side
    20,553.12x = 315,448,978.34
  5. Step 5: Solve for x
    x = 315,448,978.34/20,553.12
  6. Step 6: Final answer
    x = 15,347.99

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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.