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Finding the Fourth Proportional to 129,879.85, 194,491.72 and 103,635.85

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Solution

The fourth proportional to 129,879.85, 194,491.72 and 103,635.85 is: 155,192.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,879.85 : 194,491.72 = 103,635.85 : x
  2. Step 2: Convert to fraction form
    129,879.85/194,491.72 = 103,635.85/x
  3. Step 3: Cross multiply
    129,879.85x = 194,491.72 × 103,635.85
  4. Step 4: Simplify right side
    129,879.85x = 20,156,314,720.16
  5. Step 5: Solve for x
    x = 20,156,314,720.16/129,879.85
  6. Step 6: Final answer
    x = 155,192.01

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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.