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Finding the Fourth Proportional to 419.40, 629.17 and 141.82

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Solution

The fourth proportional to 419.40, 629.17 and 141.82 is: 212.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.40 : 629.17 = 141.82 : x
  2. Step 2: Convert to fraction form
    419.40/629.17 = 141.82/x
  3. Step 3: Cross multiply
    419.40x = 629.17 × 141.82
  4. Step 4: Simplify right side
    419.40x = 89,228.89
  5. Step 5: Solve for x
    x = 89,228.89/419.40
  6. Step 6: Final answer
    x = 212.75

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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.