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Finding the Fourth Proportional to 418.98, 629.12 and 400.49

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Solution

The fourth proportional to 418.98, 629.12 and 400.49 is: 601.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.98 : 629.12 = 400.49 : x
  2. Step 2: Convert to fraction form
    418.98/629.12 = 400.49/x
  3. Step 3: Cross multiply
    418.98x = 629.12 × 400.49
  4. Step 4: Simplify right side
    418.98x = 251,956.27
  5. Step 5: Solve for x
    x = 251,956.27/418.98
  6. Step 6: Final answer
    x = 601.36

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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.