Home / 13,129.38-18,118.67-7,161.12

Finding the Fourth Proportional to 13,129.38, 18,118.67 and 7,161.12

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Solution

The fourth proportional to 13,129.38, 18,118.67 and 7,161.12 is: 9,882.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.38 : 18,118.67 = 7,161.12 : x
  2. Step 2: Convert to fraction form
    13,129.38/18,118.67 = 7,161.12/x
  3. Step 3: Cross multiply
    13,129.38x = 18,118.67 × 7,161.12
  4. Step 4: Simplify right side
    13,129.38x = 129,749,934.30
  5. Step 5: Solve for x
    x = 129,749,934.30/13,129.38
  6. Step 6: Final answer
    x = 9,882.41

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Half scale
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Double scale
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Similar ratio
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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.