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Finding the Fourth Proportional to 982.85, 1,356.62 and 717.44

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Solution

The fourth proportional to 982.85, 1,356.62 and 717.44 is: 990.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.85 : 1,356.62 = 717.44 : x
  2. Step 2: Convert to fraction form
    982.85/1,356.62 = 717.44/x
  3. Step 3: Cross multiply
    982.85x = 1,356.62 × 717.44
  4. Step 4: Simplify right side
    982.85x = 973,283.08
  5. Step 5: Solve for x
    x = 973,283.08/982.85
  6. Step 6: Final answer
    x = 990.27

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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.