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Finding the Fourth Proportional to 511.56, 767.48 and 280.80

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Solution

The fourth proportional to 511.56, 767.48 and 280.80 is: 421.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.56 : 767.48 = 280.80 : x
  2. Step 2: Convert to fraction form
    511.56/767.48 = 280.80/x
  3. Step 3: Cross multiply
    511.56x = 767.48 × 280.80
  4. Step 4: Simplify right side
    511.56x = 215,506.98
  5. Step 5: Solve for x
    x = 215,506.98/511.56
  6. Step 6: Final answer
    x = 421.27

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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.