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Finding the Fourth Proportional to 339.77, 511.97 and 280.23

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Solution

The fourth proportional to 339.77, 511.97 and 280.23 is: 422.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.77 : 511.97 = 280.23 : x
  2. Step 2: Convert to fraction form
    339.77/511.97 = 280.23/x
  3. Step 3: Cross multiply
    339.77x = 511.97 × 280.23
  4. Step 4: Simplify right side
    339.77x = 143,469.35
  5. Step 5: Solve for x
    x = 143,469.35/339.77
  6. Step 6: Final answer
    x = 422.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.