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Finding the Fourth Proportional to 511.56, 766.78 and 223.20

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Solution

The fourth proportional to 511.56, 766.78 and 223.20 is: 334.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.56 : 766.78 = 223.20 : x
  2. Step 2: Convert to fraction form
    511.56/766.78 = 223.20/x
  3. Step 3: Cross multiply
    511.56x = 766.78 × 223.20
  4. Step 4: Simplify right side
    511.56x = 171,145.30
  5. Step 5: Solve for x
    x = 171,145.30/511.56
  6. Step 6: Final answer
    x = 334.56

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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.