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Finding the Fourth Proportional to 214.66, 321.84 and 111.90

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Solution

The fourth proportional to 214.66, 321.84 and 111.90 is: 167.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.66 : 321.84 = 111.90 : x
  2. Step 2: Convert to fraction form
    214.66/321.84 = 111.90/x
  3. Step 3: Cross multiply
    214.66x = 321.84 × 111.90
  4. Step 4: Simplify right side
    214.66x = 36,013.90
  5. Step 5: Solve for x
    x = 36,013.90/214.66
  6. Step 6: Final answer
    x = 167.77

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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.