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Finding the Fourth Proportional to 1,280.22, 1,920.44 and 622.81

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Solution

The fourth proportional to 1,280.22, 1,920.44 and 622.81 is: 934.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.22 : 1,920.44 = 622.81 : x
  2. Step 2: Convert to fraction form
    1,280.22/1,920.44 = 622.81/x
  3. Step 3: Cross multiply
    1,280.22x = 1,920.44 × 622.81
  4. Step 4: Simplify right side
    1,280.22x = 1,196,069.24
  5. Step 5: Solve for x
    x = 1,196,069.24/1,280.22
  6. Step 6: Final answer
    x = 934.27

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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.