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Finding the Fourth Proportional to 326.61, 489.36 and 211.32

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Solution

The fourth proportional to 326.61, 489.36 and 211.32 is: 316.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.61 : 489.36 = 211.32 : x
  2. Step 2: Convert to fraction form
    326.61/489.36 = 211.32/x
  3. Step 3: Cross multiply
    326.61x = 489.36 × 211.32
  4. Step 4: Simplify right side
    326.61x = 103,411.56
  5. Step 5: Solve for x
    x = 103,411.56/326.61
  6. Step 6: Final answer
    x = 316.62

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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.