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Finding the Fourth Proportional to 451.45, 622.89 and 274.40

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Solution

The fourth proportional to 451.45, 622.89 and 274.40 is: 378.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.45 : 622.89 = 274.40 : x
  2. Step 2: Convert to fraction form
    451.45/622.89 = 274.40/x
  3. Step 3: Cross multiply
    451.45x = 622.89 × 274.40
  4. Step 4: Simplify right side
    451.45x = 170,923.74
  5. Step 5: Solve for x
    x = 170,923.74/451.45
  6. Step 6: Final answer
    x = 378.61

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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.