Home / 11,147.08-15,379.86-8,781.88

Finding the Fourth Proportional to 11,147.08, 15,379.86 and 8,781.88

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Solution

The fourth proportional to 11,147.08, 15,379.86 and 8,781.88 is: 12,116.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,147.08 : 15,379.86 = 8,781.88 : x
  2. Step 2: Convert to fraction form
    11,147.08/15,379.86 = 8,781.88/x
  3. Step 3: Cross multiply
    11,147.08x = 15,379.86 × 8,781.88
  4. Step 4: Simplify right side
    11,147.08x = 135,064,084.94
  5. Step 5: Solve for x
    x = 135,064,084.94/11,147.08
  6. Step 6: Final answer
    x = 12,116.54

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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.