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Finding the Fourth Proportional to 228.70, 342.60 and 212.86

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Solution

The fourth proportional to 228.70, 342.60 and 212.86 is: 318.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.70 : 342.60 = 212.86 : x
  2. Step 2: Convert to fraction form
    228.70/342.60 = 212.86/x
  3. Step 3: Cross multiply
    228.70x = 342.60 × 212.86
  4. Step 4: Simplify right side
    228.70x = 72,925.84
  5. Step 5: Solve for x
    x = 72,925.84/228.70
  6. Step 6: Final answer
    x = 318.87

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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.