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Finding the Fourth Proportional to 274.13, 378.28 and 149.79

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Solution

The fourth proportional to 274.13, 378.28 and 149.79 is: 206.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.13 : 378.28 = 149.79 : x
  2. Step 2: Convert to fraction form
    274.13/378.28 = 149.79/x
  3. Step 3: Cross multiply
    274.13x = 378.28 × 149.79
  4. Step 4: Simplify right side
    274.13x = 56,662.19
  5. Step 5: Solve for x
    x = 56,662.19/274.13
  6. Step 6: Final answer
    x = 206.70

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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.