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Finding the Fourth Proportional to 980.87, 1,352.59 and 682.46

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Solution

The fourth proportional to 980.87, 1,352.59 and 682.46 is: 941.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.87 : 1,352.59 = 682.46 : x
  2. Step 2: Convert to fraction form
    980.87/1,352.59 = 682.46/x
  3. Step 3: Cross multiply
    980.87x = 1,352.59 × 682.46
  4. Step 4: Simplify right side
    980.87x = 923,080.10
  5. Step 5: Solve for x
    x = 923,080.10/980.87
  6. Step 6: Final answer
    x = 941.09

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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.