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Finding the Fourth Proportional to 165.43, 228.31 and 103.28

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Solution

The fourth proportional to 165.43, 228.31 and 103.28 is: 142.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.43 : 228.31 = 103.28 : x
  2. Step 2: Convert to fraction form
    165.43/228.31 = 103.28/x
  3. Step 3: Cross multiply
    165.43x = 228.31 × 103.28
  4. Step 4: Simplify right side
    165.43x = 23,580.17
  5. Step 5: Solve for x
    x = 23,580.17/165.43
  6. Step 6: Final answer
    x = 142.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.