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Finding the Fourth Proportional to 214.25, 321.45 and 111.49

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Solution

The fourth proportional to 214.25, 321.45 and 111.49 is: 167.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.25 : 321.45 = 111.49 : x
  2. Step 2: Convert to fraction form
    214.25/321.45 = 111.49/x
  3. Step 3: Cross multiply
    214.25x = 321.45 × 111.49
  4. Step 4: Simplify right side
    214.25x = 35,839.67
  5. Step 5: Solve for x
    x = 35,839.67/214.25
  6. Step 6: Final answer
    x = 167.28

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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.