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Finding the Fourth Proportional to 480.78, 721.28 and 172.66

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Solution

The fourth proportional to 480.78, 721.28 and 172.66 is: 259.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.78 : 721.28 = 172.66 : x
  2. Step 2: Convert to fraction form
    480.78/721.28 = 172.66/x
  3. Step 3: Cross multiply
    480.78x = 721.28 × 172.66
  4. Step 4: Simplify right side
    480.78x = 124,535.34
  5. Step 5: Solve for x
    x = 124,535.34/480.78
  6. Step 6: Final answer
    x = 259.03

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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.