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Finding the Fourth Proportional to 982.33, 1,355.43 and 609.40

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Solution

The fourth proportional to 982.33, 1,355.43 and 609.40 is: 840.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.33 : 1,355.43 = 609.40 : x
  2. Step 2: Convert to fraction form
    982.33/1,355.43 = 609.40/x
  3. Step 3: Cross multiply
    982.33x = 1,355.43 × 609.40
  4. Step 4: Simplify right side
    982.33x = 825,995.35
  5. Step 5: Solve for x
    x = 825,995.35/982.33
  6. Step 6: Final answer
    x = 840.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.