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Finding the Fourth Proportional to 279.82, 418.92 and 188.20

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Solution

The fourth proportional to 279.82, 418.92 and 188.20 is: 281.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.82 : 418.92 = 188.20 : x
  2. Step 2: Convert to fraction form
    279.82/418.92 = 188.20/x
  3. Step 3: Cross multiply
    279.82x = 418.92 × 188.20
  4. Step 4: Simplify right side
    279.82x = 78,840.74
  5. Step 5: Solve for x
    x = 78,840.74/279.82
  6. Step 6: Final answer
    x = 281.76

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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.