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Finding the Fourth Proportional to 980.37, 1,351.49 and 684.72

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Solution

The fourth proportional to 980.37, 1,351.49 and 684.72 is: 943.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.37 : 1,351.49 = 684.72 : x
  2. Step 2: Convert to fraction form
    980.37/1,351.49 = 684.72/x
  3. Step 3: Cross multiply
    980.37x = 1,351.49 × 684.72
  4. Step 4: Simplify right side
    980.37x = 925,388.81
  5. Step 5: Solve for x
    x = 925,388.81/980.37
  6. Step 6: Final answer
    x = 943.92

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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.