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Finding the Fourth Proportional to 279.10, 418.92 and 260.74

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Solution

The fourth proportional to 279.10, 418.92 and 260.74 is: 391.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.10 : 418.92 = 260.74 : x
  2. Step 2: Convert to fraction form
    279.10/418.92 = 260.74/x
  3. Step 3: Cross multiply
    279.10x = 418.92 × 260.74
  4. Step 4: Simplify right side
    279.10x = 109,229.20
  5. Step 5: Solve for x
    x = 109,229.20/279.10
  6. Step 6: Final answer
    x = 391.36

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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.