Home / 129,657.38-178,976.39-87,240.51

Finding the Fourth Proportional to 129,657.38, 178,976.39 and 87,240.51

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Solution

The fourth proportional to 129,657.38, 178,976.39 and 87,240.51 is: 120,425.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,657.38 : 178,976.39 = 87,240.51 : x
  2. Step 2: Convert to fraction form
    129,657.38/178,976.39 = 87,240.51/x
  3. Step 3: Cross multiply
    129,657.38x = 178,976.39 × 87,240.51
  4. Step 4: Simplify right side
    129,657.38x = 15,613,991,105.36
  5. Step 5: Solve for x
    x = 15,613,991,105.36/129,657.38
  6. Step 6: Final answer
    x = 120,425.01

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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.