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Finding the Fourth Proportional to 129,910.40, 194,731.20 and 70,620.80

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Solution

The fourth proportional to 129,910.40, 194,731.20 and 70,620.80 is: 105,858.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,910.40 : 194,731.20 = 70,620.80 : x
  2. Step 2: Convert to fraction form
    129,910.40/194,731.20 = 70,620.80/x
  3. Step 3: Cross multiply
    129,910.40x = 194,731.20 × 70,620.80
  4. Step 4: Simplify right side
    129,910.40x = 13,752,073,128.96
  5. Step 5: Solve for x
    x = 13,752,073,128.96/129,910.40
  6. Step 6: Final answer
    x = 105,858.14

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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.