Home / 20,869.76-28,800.22-11,309.91

Finding the Fourth Proportional to 20,869.76, 28,800.22 and 11,309.91

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Solution

The fourth proportional to 20,869.76, 28,800.22 and 11,309.91 is: 15,607.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,869.76 : 28,800.22 = 11,309.91 : x
  2. Step 2: Convert to fraction form
    20,869.76/28,800.22 = 11,309.91/x
  3. Step 3: Cross multiply
    20,869.76x = 28,800.22 × 11,309.91
  4. Step 4: Simplify right side
    20,869.76x = 325,727,975.91
  5. Step 5: Solve for x
    x = 325,727,975.91/20,869.76
  6. Step 6: Final answer
    x = 15,607.65

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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.