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Finding the Fourth Proportional to 326.90, 489.91 and 164.70

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Solution

The fourth proportional to 326.90, 489.91 and 164.70 is: 246.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.90 : 489.91 = 164.70 : x
  2. Step 2: Convert to fraction form
    326.90/489.91 = 164.70/x
  3. Step 3: Cross multiply
    326.90x = 489.91 × 164.70
  4. Step 4: Simplify right side
    326.90x = 80,688.18
  5. Step 5: Solve for x
    x = 80,688.18/326.90
  6. Step 6: Final answer
    x = 246.83

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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.