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Finding the Fourth Proportional to 165.69, 228.61 and 103.55

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Solution

The fourth proportional to 165.69, 228.61 and 103.55 is: 142.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.69 : 228.61 = 103.55 : x
  2. Step 2: Convert to fraction form
    165.69/228.61 = 103.55/x
  3. Step 3: Cross multiply
    165.69x = 228.61 × 103.55
  4. Step 4: Simplify right side
    165.69x = 23,672.57
  5. Step 5: Solve for x
    x = 23,672.57/165.69
  6. Step 6: Final answer
    x = 142.87

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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.