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Finding the Fourth Proportional to 129,751.91, 194,534.46 and 79,728.65

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Solution

The fourth proportional to 129,751.91, 194,534.46 and 79,728.65 is: 119,535.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,751.91 : 194,534.46 = 79,728.65 : x
  2. Step 2: Convert to fraction form
    129,751.91/194,534.46 = 79,728.65/x
  3. Step 3: Cross multiply
    129,751.91x = 194,534.46 × 79,728.65
  4. Step 4: Simplify right side
    129,751.91x = 15,509,970,725.37
  5. Step 5: Solve for x
    x = 15,509,970,725.37/129,751.91
  6. Step 6: Final answer
    x = 119,535.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.