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Finding the Fourth Proportional to 511.25, 766.86 and 186.61

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Solution

The fourth proportional to 511.25, 766.86 and 186.61 is: 279.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.25 : 766.86 = 186.61 : x
  2. Step 2: Convert to fraction form
    511.25/766.86 = 186.61/x
  3. Step 3: Cross multiply
    511.25x = 766.86 × 186.61
  4. Step 4: Simplify right side
    511.25x = 143,103.62
  5. Step 5: Solve for x
    x = 143,103.62/511.25
  6. Step 6: Final answer
    x = 279.91

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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.