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Finding the Fourth Proportional to 480.76, 721.19 and 172.79

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Solution

The fourth proportional to 480.76, 721.19 and 172.79 is: 259.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.76 : 721.19 = 172.79 : x
  2. Step 2: Convert to fraction form
    480.76/721.19 = 172.79/x
  3. Step 3: Cross multiply
    480.76x = 721.19 × 172.79
  4. Step 4: Simplify right side
    480.76x = 124,614.42
  5. Step 5: Solve for x
    x = 124,614.42/480.76
  6. Step 6: Final answer
    x = 259.20

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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.