Home / 86,919.71-129,727.91-81,244.59

Finding the Fourth Proportional to 86,919.71, 129,727.91 and 81,244.59

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Solution

The fourth proportional to 86,919.71, 129,727.91 and 81,244.59 is: 121,257.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,919.71 : 129,727.91 = 81,244.59 : x
  2. Step 2: Convert to fraction form
    86,919.71/129,727.91 = 81,244.59/x
  3. Step 3: Cross multiply
    86,919.71x = 129,727.91 × 81,244.59
  4. Step 4: Simplify right side
    86,919.71x = 10,539,690,859.51
  5. Step 5: Solve for x
    x = 10,539,690,859.51/86,919.71
  6. Step 6: Final answer
    x = 121,257.78

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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.