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Finding the Fourth Proportional to 326.72, 489.11 and 215.66

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Solution

The fourth proportional to 326.72, 489.11 and 215.66 is: 322.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.72 : 489.11 = 215.66 : x
  2. Step 2: Convert to fraction form
    326.72/489.11 = 215.66/x
  3. Step 3: Cross multiply
    326.72x = 489.11 × 215.66
  4. Step 4: Simplify right side
    326.72x = 105,482.06
  5. Step 5: Solve for x
    x = 105,482.06/326.72
  6. Step 6: Final answer
    x = 322.85

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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.