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Finding the Fourth Proportional to 419.88, 629.88 and 111.75

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Solution

The fourth proportional to 419.88, 629.88 and 111.75 is: 167.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.88 : 629.88 = 111.75 : x
  2. Step 2: Convert to fraction form
    419.88/629.88 = 111.75/x
  3. Step 3: Cross multiply
    419.88x = 629.88 × 111.75
  4. Step 4: Simplify right side
    419.88x = 70,386.31
  5. Step 5: Solve for x
    x = 70,386.31/419.88
  6. Step 6: Final answer
    x = 167.63

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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.