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Finding the Fourth Proportional to 980.89, 1,353.44 and 649.12

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Solution

The fourth proportional to 980.89, 1,353.44 and 649.12 is: 895.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.89 : 1,353.44 = 649.12 : x
  2. Step 2: Convert to fraction form
    980.89/1,353.44 = 649.12/x
  3. Step 3: Cross multiply
    980.89x = 1,353.44 × 649.12
  4. Step 4: Simplify right side
    980.89x = 878,544.97
  5. Step 5: Solve for x
    x = 878,544.97/980.89
  6. Step 6: Final answer
    x = 895.66

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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.