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Finding the Fourth Proportional to 279.30, 418.72 and 170.86

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Solution

The fourth proportional to 279.30, 418.72 and 170.86 is: 256.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.30 : 418.72 = 170.86 : x
  2. Step 2: Convert to fraction form
    279.30/418.72 = 170.86/x
  3. Step 3: Cross multiply
    279.30x = 418.72 × 170.86
  4. Step 4: Simplify right side
    279.30x = 71,542.13
  5. Step 5: Solve for x
    x = 71,542.13/279.30
  6. Step 6: Final answer
    x = 256.15

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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.