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Finding the Fourth Proportional to 1,322.13, 1,982.79 and 628.11

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Solution

The fourth proportional to 1,322.13, 1,982.79 and 628.11 is: 941.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.13 : 1,982.79 = 628.11 : x
  2. Step 2: Convert to fraction form
    1,322.13/1,982.79 = 628.11/x
  3. Step 3: Cross multiply
    1,322.13x = 1,982.79 × 628.11
  4. Step 4: Simplify right side
    1,322.13x = 1,245,410.23
  5. Step 5: Solve for x
    x = 1,245,410.23/1,322.13
  6. Step 6: Final answer
    x = 941.97

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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.