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Finding the Fourth Proportional to 129,937.40, 194,675.70 and 80,631.80

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Solution

The fourth proportional to 129,937.40, 194,675.70 and 80,631.80 is: 120,804.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,937.40 : 194,675.70 = 80,631.80 : x
  2. Step 2: Convert to fraction form
    129,937.40/194,675.70 = 80,631.80/x
  3. Step 3: Cross multiply
    129,937.40x = 194,675.70 × 80,631.80
  4. Step 4: Simplify right side
    129,937.40x = 15,697,052,107.26
  5. Step 5: Solve for x
    x = 15,697,052,107.26/129,937.40
  6. Step 6: Final answer
    x = 120,804.73

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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.