Home / 86,917.96-129,725.30-81,242.84

Finding the Fourth Proportional to 86,917.96, 129,725.30 and 81,242.84

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Solution

The fourth proportional to 86,917.96, 129,725.30 and 81,242.84 is: 121,255.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,917.96 : 129,725.30 = 81,242.84 : x
  2. Step 2: Convert to fraction form
    86,917.96/129,725.30 = 81,242.84/x
  3. Step 3: Cross multiply
    86,917.96x = 129,725.30 × 81,242.84
  4. Step 4: Simplify right side
    86,917.96x = 10,539,251,791.85
  5. Step 5: Solve for x
    x = 10,539,251,791.85/86,917.96
  6. Step 6: Final answer
    x = 121,255.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.