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Finding the Fourth Proportional to 418.82, 628.26 and 187.66

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Solution

The fourth proportional to 418.82, 628.26 and 187.66 is: 281.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.82 : 628.26 = 187.66 : x
  2. Step 2: Convert to fraction form
    418.82/628.26 = 187.66/x
  3. Step 3: Cross multiply
    418.82x = 628.26 × 187.66
  4. Step 4: Simplify right side
    418.82x = 117,899.27
  5. Step 5: Solve for x
    x = 117,899.27/418.82
  6. Step 6: Final answer
    x = 281.50

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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.