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Finding the Fourth Proportional to 228, 313.80 and 212.60

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Solution

The fourth proportional to 228, 313.80 and 212.60 is: 292.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    228 : 313.80 = 212.60 : x
  2. Step 2: Convert to fraction form
    228/313.80 = 212.60/x
  3. Step 3: Cross multiply
    228x = 313.80 × 212.60
  4. Step 4: Simplify right side
    228x = 66,713.88
  5. Step 5: Solve for x
    x = 66,713.88/228
  6. Step 6: Final answer
    x = 292.60

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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.