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Finding the Fourth Proportional to 326.40, 450.39 and 202.20

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Solution

The fourth proportional to 326.40, 450.39 and 202.20 is: 279.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.40 : 450.39 = 202.20 : x
  2. Step 2: Convert to fraction form
    326.40/450.39 = 202.20/x
  3. Step 3: Cross multiply
    326.40x = 450.39 × 202.20
  4. Step 4: Simplify right side
    326.40x = 91,068.86
  5. Step 5: Solve for x
    x = 91,068.86/326.40
  6. Step 6: Final answer
    x = 279.01

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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.