Home / 13,129.93-18,119.09-7,161.47

Finding the Fourth Proportional to 13,129.93, 18,119.09 and 7,161.47

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Solution

The fourth proportional to 13,129.93, 18,119.09 and 7,161.47 is: 9,882.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.93 : 18,119.09 = 7,161.47 : x
  2. Step 2: Convert to fraction form
    13,129.93/18,119.09 = 7,161.47/x
  3. Step 3: Cross multiply
    13,129.93x = 18,119.09 × 7,161.47
  4. Step 4: Simplify right side
    13,129.93x = 129,759,292.07
  5. Step 5: Solve for x
    x = 129,759,292.07/13,129.93
  6. Step 6: Final answer
    x = 9,882.71

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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.