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Finding the Fourth Proportional to 419.75, 629.57 and 111.63

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Solution

The fourth proportional to 419.75, 629.57 and 111.63 is: 167.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.75 : 629.57 = 111.63 : x
  2. Step 2: Convert to fraction form
    419.75/629.57 = 111.63/x
  3. Step 3: Cross multiply
    419.75x = 629.57 × 111.63
  4. Step 4: Simplify right side
    419.75x = 70,278.90
  5. Step 5: Solve for x
    x = 70,278.90/419.75
  6. Step 6: Final answer
    x = 167.43

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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.