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Finding the Fourth Proportional to 274.51, 378.78 and 222.22

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Solution

The fourth proportional to 274.51, 378.78 and 222.22 is: 306.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.51 : 378.78 = 222.22 : x
  2. Step 2: Convert to fraction form
    274.51/378.78 = 222.22/x
  3. Step 3: Cross multiply
    274.51x = 378.78 × 222.22
  4. Step 4: Simplify right side
    274.51x = 84,172.49
  5. Step 5: Solve for x
    x = 84,172.49/274.51
  6. Step 6: Final answer
    x = 306.63

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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.