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Finding the Fourth Proportional to 165.27, 228.15 and 128.61

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Solution

The fourth proportional to 165.27, 228.15 and 128.61 is: 177.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.27 : 228.15 = 128.61 : x
  2. Step 2: Convert to fraction form
    165.27/228.15 = 128.61/x
  3. Step 3: Cross multiply
    165.27x = 228.15 × 128.61
  4. Step 4: Simplify right side
    165.27x = 29,342.37
  5. Step 5: Solve for x
    x = 29,342.37/165.27
  6. Step 6: Final answer
    x = 177.54

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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.