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Finding the Fourth Proportional to 518.73, 778.11 and 172.05

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Solution

The fourth proportional to 518.73, 778.11 and 172.05 is: 258.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.73 : 778.11 = 172.05 : x
  2. Step 2: Convert to fraction form
    518.73/778.11 = 172.05/x
  3. Step 3: Cross multiply
    518.73x = 778.11 × 172.05
  4. Step 4: Simplify right side
    518.73x = 133,873.83
  5. Step 5: Solve for x
    x = 133,873.83/518.73
  6. Step 6: Final answer
    x = 258.08

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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.