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Finding the Fourth Proportional to 236.60, 323.90 and 228.40

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Solution

The fourth proportional to 236.60, 323.90 and 228.40 is: 312.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.60 : 323.90 = 228.40 : x
  2. Step 2: Convert to fraction form
    236.60/323.90 = 228.40/x
  3. Step 3: Cross multiply
    236.60x = 323.90 × 228.40
  4. Step 4: Simplify right side
    236.60x = 73,978.76
  5. Step 5: Solve for x
    x = 73,978.76/236.60
  6. Step 6: Final answer
    x = 312.67

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.