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Finding the Fourth Proportional to 1,321.99, 1,981.49 and 628.09

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Solution

The fourth proportional to 1,321.99, 1,981.49 and 628.09 is: 941.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.99 : 1,981.49 = 628.09 : x
  2. Step 2: Convert to fraction form
    1,321.99/1,981.49 = 628.09/x
  3. Step 3: Cross multiply
    1,321.99x = 1,981.49 × 628.09
  4. Step 4: Simplify right side
    1,321.99x = 1,244,545.72
  5. Step 5: Solve for x
    x = 1,244,545.72/1,321.99
  6. Step 6: Final answer
    x = 941.42

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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.