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Finding the Fourth Proportional to 274.88, 378.96 and 187.76

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Solution

The fourth proportional to 274.88, 378.96 and 187.76 is: 258.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.88 : 378.96 = 187.76 : x
  2. Step 2: Convert to fraction form
    274.88/378.96 = 187.76/x
  3. Step 3: Cross multiply
    274.88x = 378.96 × 187.76
  4. Step 4: Simplify right side
    274.88x = 71,153.53
  5. Step 5: Solve for x
    x = 71,153.53/274.88
  6. Step 6: Final answer
    x = 258.85

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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.