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Finding the Fourth Proportional to 326, 489 and 109.57

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Solution

The fourth proportional to 326, 489 and 109.57 is: 164.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    326 : 489 = 109.57 : x
  2. Step 2: Convert to fraction form
    326/489 = 109.57/x
  3. Step 3: Cross multiply
    326x = 489 × 109.57
  4. Step 4: Simplify right side
    326x = 53,579.73
  5. Step 5: Solve for x
    x = 53,579.73/326
  6. Step 6: Final answer
    x = 164.36

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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.