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Finding the Fourth Proportional to 419.50, 629.04 and 145.49

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Solution

The fourth proportional to 419.50, 629.04 and 145.49 is: 218.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.50 : 629.04 = 145.49 : x
  2. Step 2: Convert to fraction form
    419.50/629.04 = 145.49/x
  3. Step 3: Cross multiply
    419.50x = 629.04 × 145.49
  4. Step 4: Simplify right side
    419.50x = 91,519.03
  5. Step 5: Solve for x
    x = 91,519.03/419.50
  6. Step 6: Final answer
    x = 218.16

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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.