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Finding the Fourth Proportional to 480.90, 721.17 and 172.68

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Solution

The fourth proportional to 480.90, 721.17 and 172.68 is: 258.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.90 : 721.17 = 172.68 : x
  2. Step 2: Convert to fraction form
    480.90/721.17 = 172.68/x
  3. Step 3: Cross multiply
    480.90x = 721.17 × 172.68
  4. Step 4: Simplify right side
    480.90x = 124,531.64
  5. Step 5: Solve for x
    x = 124,531.64/480.90
  6. Step 6: Final answer
    x = 258.96

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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.