Home / 20,120.80-27,780.24-15,396.64

Finding the Fourth Proportional to 20,120.80, 27,780.24 and 15,396.64

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Solution

The fourth proportional to 20,120.80, 27,780.24 and 15,396.64 is: 21,257.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,120.80 : 27,780.24 = 15,396.64 : x
  2. Step 2: Convert to fraction form
    20,120.80/27,780.24 = 15,396.64/x
  3. Step 3: Cross multiply
    20,120.80x = 27,780.24 × 15,396.64
  4. Step 4: Simplify right side
    20,120.80x = 427,722,354.39
  5. Step 5: Solve for x
    x = 427,722,354.39/20,120.80
  6. Step 6: Final answer
    x = 21,257.72

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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.