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Finding the Fourth Proportional to 309.08, 426.46 and 178.09

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Solution

The fourth proportional to 309.08, 426.46 and 178.09 is: 245.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.08 : 426.46 = 178.09 : x
  2. Step 2: Convert to fraction form
    309.08/426.46 = 178.09/x
  3. Step 3: Cross multiply
    309.08x = 426.46 × 178.09
  4. Step 4: Simplify right side
    309.08x = 75,948.26
  5. Step 5: Solve for x
    x = 75,948.26/309.08
  6. Step 6: Final answer
    x = 245.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.