Home / 20,780.49-28,679.46-11,705.94

Finding the Fourth Proportional to 20,780.49, 28,679.46 and 11,705.94

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Solution

The fourth proportional to 20,780.49, 28,679.46 and 11,705.94 is: 16,155.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.49 : 28,679.46 = 11,705.94 : x
  2. Step 2: Convert to fraction form
    20,780.49/28,679.46 = 11,705.94/x
  3. Step 3: Cross multiply
    20,780.49x = 28,679.46 × 11,705.94
  4. Step 4: Simplify right side
    20,780.49x = 335,720,037.99
  5. Step 5: Solve for x
    x = 335,720,037.99/20,780.49
  6. Step 6: Final answer
    x = 16,155.54

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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.