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Finding the Fourth Proportional to 129,626.75, 178,865.80 and 75,176.60

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Solution

The fourth proportional to 129,626.75, 178,865.80 and 75,176.60 is: 103,732.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,626.75 : 178,865.80 = 75,176.60 : x
  2. Step 2: Convert to fraction form
    129,626.75/178,865.80 = 75,176.60/x
  3. Step 3: Cross multiply
    129,626.75x = 178,865.80 × 75,176.60
  4. Step 4: Simplify right side
    129,626.75x = 13,446,521,618.01
  5. Step 5: Solve for x
    x = 13,446,521,618.01/129,626.75
  6. Step 6: Final answer
    x = 103,732.61

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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.