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Finding the Fourth Proportional to 1,280.56, 1,922.04 and 664.70

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Solution

The fourth proportional to 1,280.56, 1,922.04 and 664.70 is: 997.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.56 : 1,922.04 = 664.70 : x
  2. Step 2: Convert to fraction form
    1,280.56/1,922.04 = 664.70/x
  3. Step 3: Cross multiply
    1,280.56x = 1,922.04 × 664.70
  4. Step 4: Simplify right side
    1,280.56x = 1,277,579.99
  5. Step 5: Solve for x
    x = 1,277,579.99/1,280.56
  6. Step 6: Final answer
    x = 997.67

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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.