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Finding the Fourth Proportional to 1,321.73, 1,981.85 and 443.78

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Solution

The fourth proportional to 1,321.73, 1,981.85 and 443.78 is: 665.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.73 : 1,981.85 = 443.78 : x
  2. Step 2: Convert to fraction form
    1,321.73/1,981.85 = 443.78/x
  3. Step 3: Cross multiply
    1,321.73x = 1,981.85 × 443.78
  4. Step 4: Simplify right side
    1,321.73x = 879,505.07
  5. Step 5: Solve for x
    x = 879,505.07/1,321.73
  6. Step 6: Final answer
    x = 665.42

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1.5x scale

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.