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Finding the Fourth Proportional to 165.51, 228.29 and 128.66

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Solution

The fourth proportional to 165.51, 228.29 and 128.66 is: 177.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.51 : 228.29 = 128.66 : x
  2. Step 2: Convert to fraction form
    165.51/228.29 = 128.66/x
  3. Step 3: Cross multiply
    165.51x = 228.29 × 128.66
  4. Step 4: Simplify right side
    165.51x = 29,370.01
  5. Step 5: Solve for x
    x = 29,370.01/165.51
  6. Step 6: Final answer
    x = 177.45

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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.