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Finding the Fourth Proportional to 419.75, 629.63 and 115.75

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Solution

The fourth proportional to 419.75, 629.63 and 115.75 is: 173.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.75 : 629.63 = 115.75 : x
  2. Step 2: Convert to fraction form
    419.75/629.63 = 115.75/x
  3. Step 3: Cross multiply
    419.75x = 629.63 × 115.75
  4. Step 4: Simplify right side
    419.75x = 72,879.67
  5. Step 5: Solve for x
    x = 72,879.67/419.75
  6. Step 6: Final answer
    x = 173.63

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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.