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Finding the Fourth Proportional to 419.87, 629.75 and 159.76

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Solution

The fourth proportional to 419.87, 629.75 and 159.76 is: 239.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.87 : 629.75 = 159.76 : x
  2. Step 2: Convert to fraction form
    419.87/629.75 = 159.76/x
  3. Step 3: Cross multiply
    419.87x = 629.75 × 159.76
  4. Step 4: Simplify right side
    419.87x = 100,607.69
  5. Step 5: Solve for x
    x = 100,607.69/419.87
  6. Step 6: Final answer
    x = 239.62

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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.