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Finding the Fourth Proportional to 518.90, 778.37 and 172.25

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Solution

The fourth proportional to 518.90, 778.37 and 172.25 is: 258.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.90 : 778.37 = 172.25 : x
  2. Step 2: Convert to fraction form
    518.90/778.37 = 172.25/x
  3. Step 3: Cross multiply
    518.90x = 778.37 × 172.25
  4. Step 4: Simplify right side
    518.90x = 134,075.32
  5. Step 5: Solve for x
    x = 134,075.32/518.90
  6. Step 6: Final answer
    x = 258.38

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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.