Home / 129,093.71-178,163.19-78,134.47

Finding the Fourth Proportional to 129,093.71, 178,163.19 and 78,134.47

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Solution

The fourth proportional to 129,093.71, 178,163.19 and 78,134.47 is: 107,833.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,093.71 : 178,163.19 = 78,134.47 : x
  2. Step 2: Convert to fraction form
    129,093.71/178,163.19 = 78,134.47/x
  3. Step 3: Cross multiply
    129,093.71x = 178,163.19 × 78,134.47
  4. Step 4: Simplify right side
    129,093.71x = 13,920,685,978.75
  5. Step 5: Solve for x
    x = 13,920,685,978.75/129,093.71
  6. Step 6: Final answer
    x = 107,833.96

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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.