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Finding the Fourth Proportional to 982.18, 1,354.62 and 863.90

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Solution

The fourth proportional to 982.18, 1,354.62 and 863.90 is: 1,191.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.18 : 1,354.62 = 863.90 : x
  2. Step 2: Convert to fraction form
    982.18/1,354.62 = 863.90/x
  3. Step 3: Cross multiply
    982.18x = 1,354.62 × 863.90
  4. Step 4: Simplify right side
    982.18x = 1,170,256.22
  5. Step 5: Solve for x
    x = 1,170,256.22/982.18
  6. Step 6: Final answer
    x = 1,191.49

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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.