Home / 20,921.05-28,871.25-11,489.61

Finding the Fourth Proportional to 20,921.05, 28,871.25 and 11,489.61

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Solution

The fourth proportional to 20,921.05, 28,871.25 and 11,489.61 is: 15,855.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.05 : 28,871.25 = 11,489.61 : x
  2. Step 2: Convert to fraction form
    20,921.05/28,871.25 = 11,489.61/x
  3. Step 3: Cross multiply
    20,921.05x = 28,871.25 × 11,489.61
  4. Step 4: Simplify right side
    20,921.05x = 331,719,402.71
  5. Step 5: Solve for x
    x = 331,719,402.71/20,921.05
  6. Step 6: Final answer
    x = 15,855.77

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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.