Home / 135,129.91-186,481.54-78,541.28

Finding the Fourth Proportional to 135,129.91, 186,481.54 and 78,541.28

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Solution

The fourth proportional to 135,129.91, 186,481.54 and 78,541.28 is: 108,388.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,129.91 : 186,481.54 = 78,541.28 : x
  2. Step 2: Convert to fraction form
    135,129.91/186,481.54 = 78,541.28/x
  3. Step 3: Cross multiply
    135,129.91x = 186,481.54 × 78,541.28
  4. Step 4: Simplify right side
    135,129.91x = 14,646,498,847.97
  5. Step 5: Solve for x
    x = 14,646,498,847.97/135,129.91
  6. Step 6: Final answer
    x = 108,388.29

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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.