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Finding the Fourth Proportional to 982.12, 1,355.11 and 609.12

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Solution

The fourth proportional to 982.12, 1,355.11 and 609.12 is: 840.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.12 : 1,355.11 = 609.12 : x
  2. Step 2: Convert to fraction form
    982.12/1,355.11 = 609.12/x
  3. Step 3: Cross multiply
    982.12x = 1,355.11 × 609.12
  4. Step 4: Simplify right side
    982.12x = 825,417.83
  5. Step 5: Solve for x
    x = 825,417.83/982.12
  6. Step 6: Final answer
    x = 840.44

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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.