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Finding the Fourth Proportional to 980.91, 1,470.90 and 331.19

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Solution

The fourth proportional to 980.91, 1,470.90 and 331.19 is: 496.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.91 : 1,470.90 = 331.19 : x
  2. Step 2: Convert to fraction form
    980.91/1,470.90 = 331.19/x
  3. Step 3: Cross multiply
    980.91x = 1,470.90 × 331.19
  4. Step 4: Simplify right side
    980.91x = 487,140.02
  5. Step 5: Solve for x
    x = 487,140.02/980.91
  6. Step 6: Final answer
    x = 496.62

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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.