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Finding the Fourth Proportional to 982.20, 1,354.42 and 683.79

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Solution

The fourth proportional to 982.20, 1,354.42 and 683.79 is: 942.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.20 : 1,354.42 = 683.79 : x
  2. Step 2: Convert to fraction form
    982.20/1,354.42 = 683.79/x
  3. Step 3: Cross multiply
    982.20x = 1,354.42 × 683.79
  4. Step 4: Simplify right side
    982.20x = 926,134.63
  5. Step 5: Solve for x
    x = 926,134.63/982.20
  6. Step 6: Final answer
    x = 942.91

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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.