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Finding the Fourth Proportional to 326.08, 485.40 and 321.22

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Solution

The fourth proportional to 326.08, 485.40 and 321.22 is: 478.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.08 : 485.40 = 321.22 : x
  2. Step 2: Convert to fraction form
    326.08/485.40 = 321.22/x
  3. Step 3: Cross multiply
    326.08x = 485.40 × 321.22
  4. Step 4: Simplify right side
    326.08x = 155,920.19
  5. Step 5: Solve for x
    x = 155,920.19/326.08
  6. Step 6: Final answer
    x = 478.17

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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.