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Finding the Fourth Proportional to 480.78, 721.13 and 172.46

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Solution

The fourth proportional to 480.78, 721.13 and 172.46 is: 258.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.78 : 721.13 = 172.46 : x
  2. Step 2: Convert to fraction form
    480.78/721.13 = 172.46/x
  3. Step 3: Cross multiply
    480.78x = 721.13 × 172.46
  4. Step 4: Simplify right side
    480.78x = 124,366.08
  5. Step 5: Solve for x
    x = 124,366.08/480.78
  6. Step 6: Final answer
    x = 258.68

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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.