Home / 13,129.40-18,119.01-7,161.39

Finding the Fourth Proportional to 13,129.40, 18,119.01 and 7,161.39

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Solution

The fourth proportional to 13,129.40, 18,119.01 and 7,161.39 is: 9,882.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.40 : 18,119.01 = 7,161.39 : x
  2. Step 2: Convert to fraction form
    13,129.40/18,119.01 = 7,161.39/x
  3. Step 3: Cross multiply
    13,129.40x = 18,119.01 × 7,161.39
  4. Step 4: Simplify right side
    13,129.40x = 129,757,297.02
  5. Step 5: Solve for x
    x = 129,757,297.02/13,129.40
  6. Step 6: Final answer
    x = 9,882.96

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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.