Home / 135,128.91-186,480.15-78,540.27

Finding the Fourth Proportional to 135,128.91, 186,480.15 and 78,540.27

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Solution

The fourth proportional to 135,128.91, 186,480.15 and 78,540.27 is: 108,386.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,128.91 : 186,480.15 = 78,540.27 : x
  2. Step 2: Convert to fraction form
    135,128.91/186,480.15 = 78,540.27/x
  3. Step 3: Cross multiply
    135,128.91x = 186,480.15 × 78,540.27
  4. Step 4: Simplify right side
    135,128.91x = 14,646,201,330.64
  5. Step 5: Solve for x
    x = 14,646,201,330.64/135,128.91
  6. Step 6: Final answer
    x = 108,386.88

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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.