Home / 20,989.28-28,965.13-11,557.85

Finding the Fourth Proportional to 20,989.28, 28,965.13 and 11,557.85

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Solution

The fourth proportional to 20,989.28, 28,965.13 and 11,557.85 is: 15,949.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.28 : 28,965.13 = 11,557.85 : x
  2. Step 2: Convert to fraction form
    20,989.28/28,965.13 = 11,557.85/x
  3. Step 3: Cross multiply
    20,989.28x = 28,965.13 × 11,557.85
  4. Step 4: Simplify right side
    20,989.28x = 334,774,454.05
  5. Step 5: Solve for x
    x = 334,774,454.05/20,989.28
  6. Step 6: Final answer
    x = 15,949.78

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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.