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Finding the Fourth Proportional to 279.12, 418.08 and 170.56

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Solution

The fourth proportional to 279.12, 418.08 and 170.56 is: 255.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.12 : 418.08 = 170.56 : x
  2. Step 2: Convert to fraction form
    279.12/418.08 = 170.56/x
  3. Step 3: Cross multiply
    279.12x = 418.08 × 170.56
  4. Step 4: Simplify right side
    279.12x = 71,307.72
  5. Step 5: Solve for x
    x = 71,307.72/279.12
  6. Step 6: Final answer
    x = 255.47

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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.