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Finding the Fourth Proportional to 228.55, 342.41 and 212.75

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Solution

The fourth proportional to 228.55, 342.41 and 212.75 is: 318.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.55 : 342.41 = 212.75 : x
  2. Step 2: Convert to fraction form
    228.55/342.41 = 212.75/x
  3. Step 3: Cross multiply
    228.55x = 342.41 × 212.75
  4. Step 4: Simplify right side
    228.55x = 72,847.73
  5. Step 5: Solve for x
    x = 72,847.73/228.55
  6. Step 6: Final answer
    x = 318.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.