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Finding the Fourth Proportional to 165.51, 248.20 and 84.31

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Solution

The fourth proportional to 165.51, 248.20 and 84.31 is: 126.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.51 : 248.20 = 84.31 : x
  2. Step 2: Convert to fraction form
    165.51/248.20 = 84.31/x
  3. Step 3: Cross multiply
    165.51x = 248.20 × 84.31
  4. Step 4: Simplify right side
    165.51x = 20,924.91
  5. Step 5: Solve for x
    x = 20,924.91/165.51
  6. Step 6: Final answer
    x = 126.43

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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.