Home / 20,921.40-28,871.37-11,489.94

Finding the Fourth Proportional to 20,921.40, 28,871.37 and 11,489.94

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Solution

The fourth proportional to 20,921.40, 28,871.37 and 11,489.94 is: 15,856.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.40 : 28,871.37 = 11,489.94 : x
  2. Step 2: Convert to fraction form
    20,921.40/28,871.37 = 11,489.94/x
  3. Step 3: Cross multiply
    20,921.40x = 28,871.37 × 11,489.94
  4. Step 4: Simplify right side
    20,921.40x = 331,730,309.02
  5. Step 5: Solve for x
    x = 331,730,309.02/20,921.40
  6. Step 6: Final answer
    x = 15,856.03

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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.