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Finding the Fourth Proportional to 419.90, 629.92 and 142.32

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Solution

The fourth proportional to 419.90, 629.92 and 142.32 is: 213.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.90 : 629.92 = 142.32 : x
  2. Step 2: Convert to fraction form
    419.90/629.92 = 142.32/x
  3. Step 3: Cross multiply
    419.90x = 629.92 × 142.32
  4. Step 4: Simplify right side
    419.90x = 89,650.21
  5. Step 5: Solve for x
    x = 89,650.21/419.90
  6. Step 6: Final answer
    x = 213.50

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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.