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Finding the Fourth Proportional to 165.54, 228.24 and 128.55

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Solution

The fourth proportional to 165.54, 228.24 and 128.55 is: 177.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.54 : 228.24 = 128.55 : x
  2. Step 2: Convert to fraction form
    165.54/228.24 = 128.55/x
  3. Step 3: Cross multiply
    165.54x = 228.24 × 128.55
  4. Step 4: Simplify right side
    165.54x = 29,340.25
  5. Step 5: Solve for x
    x = 29,340.25/165.54
  6. Step 6: Final answer
    x = 177.24

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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.