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Finding the Fourth Proportional to 419.66, 629 and 159.49

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Solution

The fourth proportional to 419.66, 629 and 159.49 is: 239.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.66 : 629 = 159.49 : x
  2. Step 2: Convert to fraction form
    419.66/629 = 159.49/x
  3. Step 3: Cross multiply
    419.66x = 629 × 159.49
  4. Step 4: Simplify right side
    419.66x = 100,319.21
  5. Step 5: Solve for x
    x = 100,319.21/419.66
  6. Step 6: Final answer
    x = 239.05

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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.