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Finding the Fourth Proportional to 274.56, 378.86 and 187.22

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Solution

The fourth proportional to 274.56, 378.86 and 187.22 is: 258.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.56 : 378.86 = 187.22 : x
  2. Step 2: Convert to fraction form
    274.56/378.86 = 187.22/x
  3. Step 3: Cross multiply
    274.56x = 378.86 × 187.22
  4. Step 4: Simplify right side
    274.56x = 70,930.17
  5. Step 5: Solve for x
    x = 70,930.17/274.56
  6. Step 6: Final answer
    x = 258.34

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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.