Home / 129,717.30-178,982.58-78,756.81

Finding the Fourth Proportional to 129,717.30, 178,982.58 and 78,756.81

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Solution

The fourth proportional to 129,717.30, 178,982.58 and 78,756.81 is: 108,667.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,717.30 : 178,982.58 = 78,756.81 : x
  2. Step 2: Convert to fraction form
    129,717.30/178,982.58 = 78,756.81/x
  3. Step 3: Cross multiply
    129,717.30x = 178,982.58 × 78,756.81
  4. Step 4: Simplify right side
    129,717.30x = 14,096,097,046.37
  5. Step 5: Solve for x
    x = 14,096,097,046.37/129,717.30
  6. Step 6: Final answer
    x = 108,667.83

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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.