Home / 86,918.71-129,726.42-81,243.59

Finding the Fourth Proportional to 86,918.71, 129,726.42 and 81,243.59

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Solution

The fourth proportional to 86,918.71, 129,726.42 and 81,243.59 is: 121,256.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,918.71 : 129,726.42 = 81,243.59 : x
  2. Step 2: Convert to fraction form
    86,918.71/129,726.42 = 81,243.59/x
  3. Step 3: Cross multiply
    86,918.71x = 129,726.42 × 81,243.59
  4. Step 4: Simplify right side
    86,918.71x = 10,539,440,078.65
  5. Step 5: Solve for x
    x = 10,539,440,078.65/86,918.71
  6. Step 6: Final answer
    x = 121,256.29

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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.