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Finding the Fourth Proportional to 339.39, 508.71 and 165.78

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Solution

The fourth proportional to 339.39, 508.71 and 165.78 is: 248.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.39 : 508.71 = 165.78 : x
  2. Step 2: Convert to fraction form
    339.39/508.71 = 165.78/x
  3. Step 3: Cross multiply
    339.39x = 508.71 × 165.78
  4. Step 4: Simplify right side
    339.39x = 84,333.94
  5. Step 5: Solve for x
    x = 84,333.94/339.39
  6. Step 6: Final answer
    x = 248.49

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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.