Home / 20,836.82-28,720.41-15,529.70

Finding the Fourth Proportional to 20,836.82, 28,720.41 and 15,529.70

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Solution

The fourth proportional to 20,836.82, 28,720.41 and 15,529.70 is: 21,405.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,836.82 : 28,720.41 = 15,529.70 : x
  2. Step 2: Convert to fraction form
    20,836.82/28,720.41 = 15,529.70/x
  3. Step 3: Cross multiply
    20,836.82x = 28,720.41 × 15,529.70
  4. Step 4: Simplify right side
    20,836.82x = 446,019,364.74
  5. Step 5: Solve for x
    x = 446,019,364.74/20,836.82
  6. Step 6: Final answer
    x = 21,405.34

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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.