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Finding the Fourth Proportional to 980.19, 1,470.41 and 331.11

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Solution

The fourth proportional to 980.19, 1,470.41 and 331.11 is: 496.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.19 : 1,470.41 = 331.11 : x
  2. Step 2: Convert to fraction form
    980.19/1,470.41 = 331.11/x
  3. Step 3: Cross multiply
    980.19x = 1,470.41 × 331.11
  4. Step 4: Simplify right side
    980.19x = 486,867.46
  5. Step 5: Solve for x
    x = 486,867.46/980.19
  6. Step 6: Final answer
    x = 496.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.