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Finding the Fourth Proportional to 980.23, 1,469.30 and 459.79

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Solution

The fourth proportional to 980.23, 1,469.30 and 459.79 is: 689.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.23 : 1,469.30 = 459.79 : x
  2. Step 2: Convert to fraction form
    980.23/1,469.30 = 459.79/x
  3. Step 3: Cross multiply
    980.23x = 1,469.30 × 459.79
  4. Step 4: Simplify right side
    980.23x = 675,570.60
  5. Step 5: Solve for x
    x = 675,570.60/980.23
  6. Step 6: Final answer
    x = 689.20

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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.