Home / 13,129.80-18,119.40-7,161.96

Finding the Fourth Proportional to 13,129.80, 18,119.40 and 7,161.96

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Solution

The fourth proportional to 13,129.80, 18,119.40 and 7,161.96 is: 9,883.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.80 : 18,119.40 = 7,161.96 : x
  2. Step 2: Convert to fraction form
    13,129.80/18,119.40 = 7,161.96/x
  3. Step 3: Cross multiply
    13,129.80x = 18,119.40 × 7,161.96
  4. Step 4: Simplify right side
    13,129.80x = 129,770,418.02
  5. Step 5: Solve for x
    x = 129,770,418.02/13,129.80
  6. Step 6: Final answer
    x = 9,883.66

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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.