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Finding the Fourth Proportional to 214.78, 298.45 and 212.55

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Solution

The fourth proportional to 214.78, 298.45 and 212.55 is: 295.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.78 : 298.45 = 212.55 : x
  2. Step 2: Convert to fraction form
    214.78/298.45 = 212.55/x
  3. Step 3: Cross multiply
    214.78x = 298.45 × 212.55
  4. Step 4: Simplify right side
    214.78x = 63,435.55
  5. Step 5: Solve for x
    x = 63,435.55/214.78
  6. Step 6: Final answer
    x = 295.35

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.