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Finding the Fourth Proportional to 519.18, 778.90 and 172.56

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Solution

The fourth proportional to 519.18, 778.90 and 172.56 is: 258.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.18 : 778.90 = 172.56 : x
  2. Step 2: Convert to fraction form
    519.18/778.90 = 172.56/x
  3. Step 3: Cross multiply
    519.18x = 778.90 × 172.56
  4. Step 4: Simplify right side
    519.18x = 134,406.98
  5. Step 5: Solve for x
    x = 134,406.98/519.18
  6. Step 6: Final answer
    x = 258.88

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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.