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Finding the Fourth Proportional to 1,920.70, 2,880.78 and 622

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Solution

The fourth proportional to 1,920.70, 2,880.78 and 622 is: 932.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.70 : 2,880.78 = 622 : x
  2. Step 2: Convert to fraction form
    1,920.70/2,880.78 = 622/x
  3. Step 3: Cross multiply
    1,920.70x = 2,880.78 × 622
  4. Step 4: Simplify right side
    1,920.70x = 1,791,845.16
  5. Step 5: Solve for x
    x = 1,791,845.16/1,920.70
  6. Step 6: Final answer
    x = 932.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.