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Finding the Fourth Proportional to 419.25, 628.78 and 159.28

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Solution

The fourth proportional to 419.25, 628.78 and 159.28 is: 238.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.25 : 628.78 = 159.28 : x
  2. Step 2: Convert to fraction form
    419.25/628.78 = 159.28/x
  3. Step 3: Cross multiply
    419.25x = 628.78 × 159.28
  4. Step 4: Simplify right side
    419.25x = 100,148.14
  5. Step 5: Solve for x
    x = 100,148.14/419.25
  6. Step 6: Final answer
    x = 238.87

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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.