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Finding the Fourth Proportional to 129,489.67, 193,976.16 and 102,880.72

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Solution

The fourth proportional to 129,489.67, 193,976.16 and 102,880.72 is: 154,115.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,489.67 : 193,976.16 = 102,880.72 : x
  2. Step 2: Convert to fraction form
    129,489.67/193,976.16 = 102,880.72/x
  3. Step 3: Cross multiply
    129,489.67x = 193,976.16 × 102,880.72
  4. Step 4: Simplify right side
    129,489.67x = 19,956,407,003.64
  5. Step 5: Solve for x
    x = 19,956,407,003.64/129,489.67
  6. Step 6: Final answer
    x = 154,115.82

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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.