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Finding the Fourth Proportional to 412.96, 618.68 and 326.84

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Solution

The fourth proportional to 412.96, 618.68 and 326.84 is: 489.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.96 : 618.68 = 326.84 : x
  2. Step 2: Convert to fraction form
    412.96/618.68 = 326.84/x
  3. Step 3: Cross multiply
    412.96x = 618.68 × 326.84
  4. Step 4: Simplify right side
    412.96x = 202,209.37
  5. Step 5: Solve for x
    x = 202,209.37/412.96
  6. Step 6: Final answer
    x = 489.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.