Home / 87,837.31-121,419.78-78,371.01

Finding the Fourth Proportional to 87,837.31, 121,419.78 and 78,371.01

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Solution

The fourth proportional to 87,837.31, 121,419.78 and 78,371.01 is: 108,334.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,837.31 : 121,419.78 = 78,371.01 : x
  2. Step 2: Convert to fraction form
    87,837.31/121,419.78 = 78,371.01/x
  3. Step 3: Cross multiply
    87,837.31x = 121,419.78 × 78,371.01
  4. Step 4: Simplify right side
    87,837.31x = 9,515,790,954.01
  5. Step 5: Solve for x
    x = 9,515,790,954.01/87,837.31
  6. Step 6: Final answer
    x = 108,334.27

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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.