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Finding the Fourth Proportional to 129,620.80, 194,431.20 and 120,872.80

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Solution

The fourth proportional to 129,620.80, 194,431.20 and 120,872.80 is: 181,309.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,620.80 : 194,431.20 = 120,872.80 : x
  2. Step 2: Convert to fraction form
    129,620.80/194,431.20 = 120,872.80/x
  3. Step 3: Cross multiply
    129,620.80x = 194,431.20 × 120,872.80
  4. Step 4: Simplify right side
    129,620.80x = 23,501,443,551.36
  5. Step 5: Solve for x
    x = 23,501,443,551.36/129,620.80
  6. Step 6: Final answer
    x = 181,309.20

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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.