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Finding the Fourth Proportional to 326.78, 450.90 and 202.48

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Solution

The fourth proportional to 326.78, 450.90 and 202.48 is: 279.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.78 : 450.90 = 202.48 : x
  2. Step 2: Convert to fraction form
    326.78/450.90 = 202.48/x
  3. Step 3: Cross multiply
    326.78x = 450.90 × 202.48
  4. Step 4: Simplify right side
    326.78x = 91,298.23
  5. Step 5: Solve for x
    x = 91,298.23/326.78
  6. Step 6: Final answer
    x = 279.39

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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.