Home / 129,716.91-178,982.10-78,756.44

Finding the Fourth Proportional to 129,716.91, 178,982.10 and 78,756.44

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Solution

The fourth proportional to 129,716.91, 178,982.10 and 78,756.44 is: 108,667.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,716.91 : 178,982.10 = 78,756.44 : x
  2. Step 2: Convert to fraction form
    129,716.91/178,982.10 = 78,756.44/x
  3. Step 3: Cross multiply
    129,716.91x = 178,982.10 × 78,756.44
  4. Step 4: Simplify right side
    129,716.91x = 14,095,992,124.81
  5. Step 5: Solve for x
    x = 14,095,992,124.81/129,716.91
  6. Step 6: Final answer
    x = 108,667.34

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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.