Home / 129,743.56-178,945.36-81,979.48

Finding the Fourth Proportional to 129,743.56, 178,945.36 and 81,979.48

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Solution

The fourth proportional to 129,743.56, 178,945.36 and 81,979.48 is: 113,068.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,743.56 : 178,945.36 = 81,979.48 : x
  2. Step 2: Convert to fraction form
    129,743.56/178,945.36 = 81,979.48/x
  3. Step 3: Cross multiply
    129,743.56x = 178,945.36 × 81,979.48
  4. Step 4: Simplify right side
    129,743.56x = 14,669,847,561.21
  5. Step 5: Solve for x
    x = 14,669,847,561.21/129,743.56
  6. Step 6: Final answer
    x = 113,068.02

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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.