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Finding the Fourth Proportional to 511.09, 766.96 and 280.14

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Solution

The fourth proportional to 511.09, 766.96 and 280.14 is: 420.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.09 : 766.96 = 280.14 : x
  2. Step 2: Convert to fraction form
    511.09/766.96 = 280.14/x
  3. Step 3: Cross multiply
    511.09x = 766.96 × 280.14
  4. Step 4: Simplify right side
    511.09x = 214,855.90
  5. Step 5: Solve for x
    x = 214,855.90/511.09
  6. Step 6: Final answer
    x = 420.39

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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.