Home / 11,115.90-16,653.60-8,791.20

Finding the Fourth Proportional to 11,115.90, 16,653.60 and 8,791.20

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Solution

The fourth proportional to 11,115.90, 16,653.60 and 8,791.20 is: 13,170.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,115.90 : 16,653.60 = 8,791.20 : x
  2. Step 2: Convert to fraction form
    11,115.90/16,653.60 = 8,791.20/x
  3. Step 3: Cross multiply
    11,115.90x = 16,653.60 × 8,791.20
  4. Step 4: Simplify right side
    11,115.90x = 146,405,128.32
  5. Step 5: Solve for x
    x = 146,405,128.32/11,115.90
  6. Step 6: Final answer
    x = 13,170.78

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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.