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Finding the Fourth Proportional to 309.10, 426.61 and 176.34

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Solution

The fourth proportional to 309.10, 426.61 and 176.34 is: 243.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.10 : 426.61 = 176.34 : x
  2. Step 2: Convert to fraction form
    309.10/426.61 = 176.34/x
  3. Step 3: Cross multiply
    309.10x = 426.61 × 176.34
  4. Step 4: Simplify right side
    309.10x = 75,229.73
  5. Step 5: Solve for x
    x = 75,229.73/309.10
  6. Step 6: Final answer
    x = 243.38

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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.