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Finding the Fourth Proportional to 980.27, 1,470.40 and 331.02

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Solution

The fourth proportional to 980.27, 1,470.40 and 331.02 is: 496.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.27 : 1,470.40 = 331.02 : x
  2. Step 2: Convert to fraction form
    980.27/1,470.40 = 331.02/x
  3. Step 3: Cross multiply
    980.27x = 1,470.40 × 331.02
  4. Step 4: Simplify right side
    980.27x = 486,730.98
  5. Step 5: Solve for x
    x = 486,730.98/980.27
  6. Step 6: Final answer
    x = 496.53

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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.