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Finding the Fourth Proportional to 326.34, 487.64 and 308.79

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Solution

The fourth proportional to 326.34, 487.64 and 308.79 is: 461.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.34 : 487.64 = 308.79 : x
  2. Step 2: Convert to fraction form
    326.34/487.64 = 308.79/x
  3. Step 3: Cross multiply
    326.34x = 487.64 × 308.79
  4. Step 4: Simplify right side
    326.34x = 150,579.13
  5. Step 5: Solve for x
    x = 150,579.13/326.34
  6. Step 6: Final answer
    x = 461.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.