Home / 13,129.48-18,118.11-7,161

Finding the Fourth Proportional to 13,129.48, 18,118.11 and 7,161

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Solution

The fourth proportional to 13,129.48, 18,118.11 and 7,161 is: 9,881.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.48 : 18,118.11 = 7,161 : x
  2. Step 2: Convert to fraction form
    13,129.48/18,118.11 = 7,161/x
  3. Step 3: Cross multiply
    13,129.48x = 18,118.11 × 7,161
  4. Step 4: Simplify right side
    13,129.48x = 129,743,785.71
  5. Step 5: Solve for x
    x = 129,743,785.71/13,129.48
  6. Step 6: Final answer
    x = 9,881.87

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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.