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Finding the Fourth Proportional to 309.32, 426.78 and 176.54

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Solution

The fourth proportional to 309.32, 426.78 and 176.54 is: 243.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.32 : 426.78 = 176.54 : x
  2. Step 2: Convert to fraction form
    309.32/426.78 = 176.54/x
  3. Step 3: Cross multiply
    309.32x = 426.78 × 176.54
  4. Step 4: Simplify right side
    309.32x = 75,343.74
  5. Step 5: Solve for x
    x = 75,343.74/309.32
  6. Step 6: Final answer
    x = 243.58

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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.