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Finding the Fourth Proportional to 279.21, 418.92 and 105.89

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Solution

The fourth proportional to 279.21, 418.92 and 105.89 is: 158.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.21 : 418.92 = 105.89 : x
  2. Step 2: Convert to fraction form
    279.21/418.92 = 105.89/x
  3. Step 3: Cross multiply
    279.21x = 418.92 × 105.89
  4. Step 4: Simplify right side
    279.21x = 44,356.81
  5. Step 5: Solve for x
    x = 44,356.81/279.21
  6. Step 6: Final answer
    x = 158.87

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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.