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Finding the Fourth Proportional to 419.75, 629.50 and 290.58

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Solution

The fourth proportional to 419.75, 629.50 and 290.58 is: 435.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.75 : 629.50 = 290.58 : x
  2. Step 2: Convert to fraction form
    419.75/629.50 = 290.58/x
  3. Step 3: Cross multiply
    419.75x = 629.50 × 290.58
  4. Step 4: Simplify right side
    419.75x = 182,922.29
  5. Step 5: Solve for x
    x = 182,922.29/419.75
  6. Step 6: Final answer
    x = 435.79

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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.