Home / 20,115.36-30,162.80-10,878.88

Finding the Fourth Proportional to 20,115.36, 30,162.80 and 10,878.88

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Solution

The fourth proportional to 20,115.36, 30,162.80 and 10,878.88 is: 16,312.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,115.36 : 30,162.80 = 10,878.88 : x
  2. Step 2: Convert to fraction form
    20,115.36/30,162.80 = 10,878.88/x
  3. Step 3: Cross multiply
    20,115.36x = 30,162.80 × 10,878.88
  4. Step 4: Simplify right side
    20,115.36x = 328,137,481.66
  5. Step 5: Solve for x
    x = 328,137,481.66/20,115.36
  6. Step 6: Final answer
    x = 16,312.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.