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Finding the Fourth Proportional to 274.14, 378.31 and 149.80

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Solution

The fourth proportional to 274.14, 378.31 and 149.80 is: 206.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.14 : 378.31 = 149.80 : x
  2. Step 2: Convert to fraction form
    274.14/378.31 = 149.80/x
  3. Step 3: Cross multiply
    274.14x = 378.31 × 149.80
  4. Step 4: Simplify right side
    274.14x = 56,669.52
  5. Step 5: Solve for x
    x = 56,669.52/274.14
  6. Step 6: Final answer
    x = 206.72

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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.