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Finding the Fourth Proportional to 982.13, 1,354.63 and 679.42

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Solution

The fourth proportional to 982.13, 1,354.63 and 679.42 is: 937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.13 : 1,354.63 = 679.42 : x
  2. Step 2: Convert to fraction form
    982.13/1,354.63 = 679.42/x
  3. Step 3: Cross multiply
    982.13x = 1,354.63 × 679.42
  4. Step 4: Simplify right side
    982.13x = 920,352.54
  5. Step 5: Solve for x
    x = 920,352.54/982.13
  6. Step 6: Final answer
    x = 937.10

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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.