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Finding the Fourth Proportional to 511.87, 767.81 and 165.20

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Solution

The fourth proportional to 511.87, 767.81 and 165.20 is: 247.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.87 : 767.81 = 165.20 : x
  2. Step 2: Convert to fraction form
    511.87/767.81 = 165.20/x
  3. Step 3: Cross multiply
    511.87x = 767.81 × 165.20
  4. Step 4: Simplify right side
    511.87x = 126,842.21
  5. Step 5: Solve for x
    x = 126,842.21/511.87
  6. Step 6: Final answer
    x = 247.80

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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.