Home / 11,143.12-15,379.20-7,111.69

Finding the Fourth Proportional to 11,143.12, 15,379.20 and 7,111.69

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Solution

The fourth proportional to 11,143.12, 15,379.20 and 7,111.69 is: 9,815.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,143.12 : 15,379.20 = 7,111.69 : x
  2. Step 2: Convert to fraction form
    11,143.12/15,379.20 = 7,111.69/x
  3. Step 3: Cross multiply
    11,143.12x = 15,379.20 × 7,111.69
  4. Step 4: Simplify right side
    11,143.12x = 109,372,137.66
  5. Step 5: Solve for x
    x = 109,372,137.66/11,143.12
  6. Step 6: Final answer
    x = 9,815.21

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Double scale
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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.