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Finding the Fourth Proportional to 1,280.46, 1,920.69 and 414.75

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Solution

The fourth proportional to 1,280.46, 1,920.69 and 414.75 is: 622.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.46 : 1,920.69 = 414.75 : x
  2. Step 2: Convert to fraction form
    1,280.46/1,920.69 = 414.75/x
  3. Step 3: Cross multiply
    1,280.46x = 1,920.69 × 414.75
  4. Step 4: Simplify right side
    1,280.46x = 796,606.18
  5. Step 5: Solve for x
    x = 796,606.18/1,280.46
  6. Step 6: Final answer
    x = 622.13

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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.