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Finding the Fourth Proportional to 419.71, 629.66 and 131.17

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Solution

The fourth proportional to 419.71, 629.66 and 131.17 is: 196.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.71 : 629.66 = 131.17 : x
  2. Step 2: Convert to fraction form
    419.71/629.66 = 131.17/x
  3. Step 3: Cross multiply
    419.71x = 629.66 × 131.17
  4. Step 4: Simplify right side
    419.71x = 82,592.50
  5. Step 5: Solve for x
    x = 82,592.50/419.71
  6. Step 6: Final answer
    x = 196.78

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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.