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Finding the Fourth Proportional to 165.71, 228.52 and 128.86

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Solution

The fourth proportional to 165.71, 228.52 and 128.86 is: 177.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.71 : 228.52 = 128.86 : x
  2. Step 2: Convert to fraction form
    165.71/228.52 = 128.86/x
  3. Step 3: Cross multiply
    165.71x = 228.52 × 128.86
  4. Step 4: Simplify right side
    165.71x = 29,446.68
  5. Step 5: Solve for x
    x = 29,446.68/165.71
  6. Step 6: Final answer
    x = 177.70

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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.