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Finding the Fourth Proportional to 480.81, 720.72 and 326.75

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Solution

The fourth proportional to 480.81, 720.72 and 326.75 is: 489.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.81 : 720.72 = 326.75 : x
  2. Step 2: Convert to fraction form
    480.81/720.72 = 326.75/x
  3. Step 3: Cross multiply
    480.81x = 720.72 × 326.75
  4. Step 4: Simplify right side
    480.81x = 235,495.26
  5. Step 5: Solve for x
    x = 235,495.26/480.81
  6. Step 6: Final answer
    x = 489.79

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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.