Home / 129,470.91-178,694.69-78,511.52

Finding the Fourth Proportional to 129,470.91, 178,694.69 and 78,511.52

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Solution

The fourth proportional to 129,470.91, 178,694.69 and 78,511.52 is: 108,360.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,470.91 : 178,694.69 = 78,511.52 : x
  2. Step 2: Convert to fraction form
    129,470.91/178,694.69 = 78,511.52/x
  3. Step 3: Cross multiply
    129,470.91x = 178,694.69 × 78,511.52
  4. Step 4: Simplify right side
    129,470.91x = 14,029,590,441.80
  5. Step 5: Solve for x
    x = 14,029,590,441.80/129,470.91
  6. Step 6: Final answer
    x = 108,360.95

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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.