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Finding the Fourth Proportional to 519.15, 778.86 and 172.51

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Solution

The fourth proportional to 519.15, 778.86 and 172.51 is: 258.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.15 : 778.86 = 172.51 : x
  2. Step 2: Convert to fraction form
    519.15/778.86 = 172.51/x
  3. Step 3: Cross multiply
    519.15x = 778.86 × 172.51
  4. Step 4: Simplify right side
    519.15x = 134,361.14
  5. Step 5: Solve for x
    x = 134,361.14/519.15
  6. Step 6: Final answer
    x = 258.81

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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.