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Finding the Fourth Proportional to 129,872.40, 194,808.60 and 121,999.20

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Solution

The fourth proportional to 129,872.40, 194,808.60 and 121,999.20 is: 182,998.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,872.40 : 194,808.60 = 121,999.20 : x
  2. Step 2: Convert to fraction form
    129,872.40/194,808.60 = 121,999.20/x
  3. Step 3: Cross multiply
    129,872.40x = 194,808.60 × 121,999.20
  4. Step 4: Simplify right side
    129,872.40x = 23,766,493,353.12
  5. Step 5: Solve for x
    x = 23,766,493,353.12/129,872.40
  6. Step 6: Final answer
    x = 182,998.80

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1.5x scale

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.