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Finding the Fourth Proportional to 419.44, 629.20 and 130.90

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Solution

The fourth proportional to 419.44, 629.20 and 130.90 is: 196.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.44 : 629.20 = 130.90 : x
  2. Step 2: Convert to fraction form
    419.44/629.20 = 130.90/x
  3. Step 3: Cross multiply
    419.44x = 629.20 × 130.90
  4. Step 4: Simplify right side
    419.44x = 82,362.28
  5. Step 5: Solve for x
    x = 82,362.28/419.44
  6. Step 6: Final answer
    x = 196.36

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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.