Home / 129,708.78-178,998.11-73,120.15

Finding the Fourth Proportional to 129,708.78, 178,998.11 and 73,120.15

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Solution

The fourth proportional to 129,708.78, 178,998.11 and 73,120.15 is: 100,905.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,708.78 : 178,998.11 = 73,120.15 : x
  2. Step 2: Convert to fraction form
    129,708.78/178,998.11 = 73,120.15/x
  3. Step 3: Cross multiply
    129,708.78x = 178,998.11 × 73,120.15
  4. Step 4: Simplify right side
    129,708.78x = 13,088,369,196.56
  5. Step 5: Solve for x
    x = 13,088,369,196.56/129,708.78
  6. Step 6: Final answer
    x = 100,905.81

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1.5x scale

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.