Home / 129,661.76-178,906.17-78,701.25

Finding the Fourth Proportional to 129,661.76, 178,906.17 and 78,701.25

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Solution

The fourth proportional to 129,661.76, 178,906.17 and 78,701.25 is: 108,591.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,661.76 : 178,906.17 = 78,701.25 : x
  2. Step 2: Convert to fraction form
    129,661.76/178,906.17 = 78,701.25/x
  3. Step 3: Cross multiply
    129,661.76x = 178,906.17 × 78,701.25
  4. Step 4: Simplify right side
    129,661.76x = 14,080,138,225.53
  5. Step 5: Solve for x
    x = 14,080,138,225.53/129,661.76
  6. Step 6: Final answer
    x = 108,591.29

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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.