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Finding the Fourth Proportional to 418.21, 626.68 and 198.70

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Solution

The fourth proportional to 418.21, 626.68 and 198.70 is: 297.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.21 : 626.68 = 198.70 : x
  2. Step 2: Convert to fraction form
    418.21/626.68 = 198.70/x
  3. Step 3: Cross multiply
    418.21x = 626.68 × 198.70
  4. Step 4: Simplify right side
    418.21x = 124,521.32
  5. Step 5: Solve for x
    x = 124,521.32/418.21
  6. Step 6: Final answer
    x = 297.75

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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.