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Finding the Fourth Proportional to 419.87, 629.78 and 145.96

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Solution

The fourth proportional to 419.87, 629.78 and 145.96 is: 218.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.87 : 629.78 = 145.96 : x
  2. Step 2: Convert to fraction form
    419.87/629.78 = 145.96/x
  3. Step 3: Cross multiply
    419.87x = 629.78 × 145.96
  4. Step 4: Simplify right side
    419.87x = 91,921.48
  5. Step 5: Solve for x
    x = 91,921.48/419.87
  6. Step 6: Final answer
    x = 218.93

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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.