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Finding the Fourth Proportional to 326.17, 489.21 and 152.80

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Solution

The fourth proportional to 326.17, 489.21 and 152.80 is: 229.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.17 : 489.21 = 152.80 : x
  2. Step 2: Convert to fraction form
    326.17/489.21 = 152.80/x
  3. Step 3: Cross multiply
    326.17x = 489.21 × 152.80
  4. Step 4: Simplify right side
    326.17x = 74,751.29
  5. Step 5: Solve for x
    x = 74,751.29/326.17
  6. Step 6: Final answer
    x = 229.18

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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.