Home / 13,129.92-18,118.68-7,161.60

Finding the Fourth Proportional to 13,129.92, 18,118.68 and 7,161.60

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Solution

The fourth proportional to 13,129.92, 18,118.68 and 7,161.60 is: 9,882.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.92 : 18,118.68 = 7,161.60 : x
  2. Step 2: Convert to fraction form
    13,129.92/18,118.68 = 7,161.60/x
  3. Step 3: Cross multiply
    13,129.92x = 18,118.68 × 7,161.60
  4. Step 4: Simplify right side
    13,129.92x = 129,758,738.69
  5. Step 5: Solve for x
    x = 129,758,738.69/13,129.92
  6. Step 6: Final answer
    x = 9,882.68

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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.