Home / 20,921.34-28,870.76-11,489.28

Finding the Fourth Proportional to 20,921.34, 28,870.76 and 11,489.28

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Solution

The fourth proportional to 20,921.34, 28,870.76 and 11,489.28 is: 15,854.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.34 : 28,870.76 = 11,489.28 : x
  2. Step 2: Convert to fraction form
    20,921.34/28,870.76 = 11,489.28/x
  3. Step 3: Cross multiply
    20,921.34x = 28,870.76 × 11,489.28
  4. Step 4: Simplify right side
    20,921.34x = 331,704,245.45
  5. Step 5: Solve for x
    x = 331,704,245.45/20,921.34
  6. Step 6: Final answer
    x = 15,854.83

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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.