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Finding the Fourth Proportional to 165.56, 228.44 and 128.74

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Solution

The fourth proportional to 165.56, 228.44 and 128.74 is: 177.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.56 : 228.44 = 128.74 : x
  2. Step 2: Convert to fraction form
    165.56/228.44 = 128.74/x
  3. Step 3: Cross multiply
    165.56x = 228.44 × 128.74
  4. Step 4: Simplify right side
    165.56x = 29,409.37
  5. Step 5: Solve for x
    x = 29,409.37/165.56
  6. Step 6: Final answer
    x = 177.64

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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.