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Finding the Fourth Proportional to 165.51, 228.12 and 128.61

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Solution

The fourth proportional to 165.51, 228.12 and 128.61 is: 177.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.51 : 228.12 = 128.61 : x
  2. Step 2: Convert to fraction form
    165.51/228.12 = 128.61/x
  3. Step 3: Cross multiply
    165.51x = 228.12 × 128.61
  4. Step 4: Simplify right side
    165.51x = 29,338.51
  5. Step 5: Solve for x
    x = 29,338.51/165.51
  6. Step 6: Final answer
    x = 177.26

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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.