Home / 135,645.09-187,145.42-81,909.69

Finding the Fourth Proportional to 135,645.09, 187,145.42 and 81,909.69

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Solution

The fourth proportional to 135,645.09, 187,145.42 and 81,909.69 is: 113,008.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,645.09 : 187,145.42 = 81,909.69 : x
  2. Step 2: Convert to fraction form
    135,645.09/187,145.42 = 81,909.69/x
  3. Step 3: Cross multiply
    135,645.09x = 187,145.42 × 81,909.69
  4. Step 4: Simplify right side
    135,645.09x = 15,329,022,927.57
  5. Step 5: Solve for x
    x = 15,329,022,927.57/135,645.09
  6. Step 6: Final answer
    x = 113,008.31

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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.