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Finding the Fourth Proportional to 519.21, 779.27 and 438.11

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Solution

The fourth proportional to 519.21, 779.27 and 438.11 is: 657.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.21 : 779.27 = 438.11 : x
  2. Step 2: Convert to fraction form
    519.21/779.27 = 438.11/x
  3. Step 3: Cross multiply
    519.21x = 779.27 × 438.11
  4. Step 4: Simplify right side
    519.21x = 341,405.28
  5. Step 5: Solve for x
    x = 341,405.28/519.21
  6. Step 6: Final answer
    x = 657.55

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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.