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Finding the Fourth Proportional to 518.19, 777.12 and 205.77

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Solution

The fourth proportional to 518.19, 777.12 and 205.77 is: 308.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.19 : 777.12 = 205.77 : x
  2. Step 2: Convert to fraction form
    518.19/777.12 = 205.77/x
  3. Step 3: Cross multiply
    518.19x = 777.12 × 205.77
  4. Step 4: Simplify right side
    518.19x = 159,907.98
  5. Step 5: Solve for x
    x = 159,907.98/518.19
  6. Step 6: Final answer
    x = 308.59

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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.