Home / 20,921.50-28,871.67-11,489.86

Finding the Fourth Proportional to 20,921.50, 28,871.67 and 11,489.86

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Solution

The fourth proportional to 20,921.50, 28,871.67 and 11,489.86 is: 15,856.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.50 : 28,871.67 = 11,489.86 : x
  2. Step 2: Convert to fraction form
    20,921.50/28,871.67 = 11,489.86/x
  3. Step 3: Cross multiply
    20,921.50x = 28,871.67 × 11,489.86
  4. Step 4: Simplify right side
    20,921.50x = 331,731,446.27
  5. Step 5: Solve for x
    x = 331,731,446.27/20,921.50
  6. Step 6: Final answer
    x = 15,856.01

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1.5x scale

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.