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Finding the Fourth Proportional to 129,751.40, 194,396.70 and 80,445.80

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Solution

The fourth proportional to 129,751.40, 194,396.70 and 80,445.80 is: 120,525.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,751.40 : 194,396.70 = 80,445.80 : x
  2. Step 2: Convert to fraction form
    129,751.40/194,396.70 = 80,445.80/x
  3. Step 3: Cross multiply
    129,751.40x = 194,396.70 × 80,445.80
  4. Step 4: Simplify right side
    129,751.40x = 15,638,398,048.86
  5. Step 5: Solve for x
    x = 15,638,398,048.86/129,751.40
  6. Step 6: Final answer
    x = 120,525.85

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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.