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Finding the Fourth Proportional to 129,687.90, 194,143.05 and 121,998.30

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Solution

The fourth proportional to 129,687.90, 194,143.05 and 121,998.30 is: 182,631.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,687.90 : 194,143.05 = 121,998.30 : x
  2. Step 2: Convert to fraction form
    129,687.90/194,143.05 = 121,998.30/x
  3. Step 3: Cross multiply
    129,687.90x = 194,143.05 × 121,998.30
  4. Step 4: Simplify right side
    129,687.90x = 23,685,122,056.82
  5. Step 5: Solve for x
    x = 23,685,122,056.82/129,687.90
  6. Step 6: Final answer
    x = 182,631.70

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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.