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Finding the Fourth Proportional to 165.50, 228.39 and 113.78

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Solution

The fourth proportional to 165.50, 228.39 and 113.78 is: 157.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.50 : 228.39 = 113.78 : x
  2. Step 2: Convert to fraction form
    165.50/228.39 = 113.78/x
  3. Step 3: Cross multiply
    165.50x = 228.39 × 113.78
  4. Step 4: Simplify right side
    165.50x = 25,986.21
  5. Step 5: Solve for x
    x = 25,986.21/165.50
  6. Step 6: Final answer
    x = 157.02

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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.