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Finding the Fourth Proportional to 418.05, 626.64 and 186.78

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Solution

The fourth proportional to 418.05, 626.64 and 186.78 is: 279.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.05 : 626.64 = 186.78 : x
  2. Step 2: Convert to fraction form
    418.05/626.64 = 186.78/x
  3. Step 3: Cross multiply
    418.05x = 626.64 × 186.78
  4. Step 4: Simplify right side
    418.05x = 117,043.82
  5. Step 5: Solve for x
    x = 117,043.82/418.05
  6. Step 6: Final answer
    x = 279.98

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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.