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Finding the Fourth Proportional to 339.78, 511.21 and 202.92

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Solution

The fourth proportional to 339.78, 511.21 and 202.92 is: 305.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.78 : 511.21 = 202.92 : x
  2. Step 2: Convert to fraction form
    339.78/511.21 = 202.92/x
  3. Step 3: Cross multiply
    339.78x = 511.21 × 202.92
  4. Step 4: Simplify right side
    339.78x = 103,733.72
  5. Step 5: Solve for x
    x = 103,733.72/339.78
  6. Step 6: Final answer
    x = 305.30

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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.