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Finding the Fourth Proportional to 980.90, 1,471.73 and 689.01

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Solution

The fourth proportional to 980.90, 1,471.73 and 689.01 is: 1,033.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.90 : 1,471.73 = 689.01 : x
  2. Step 2: Convert to fraction form
    980.90/1,471.73 = 689.01/x
  3. Step 3: Cross multiply
    980.90x = 1,471.73 × 689.01
  4. Step 4: Simplify right side
    980.90x = 1,014,033.24
  5. Step 5: Solve for x
    x = 1,014,033.24/980.90
  6. Step 6: Final answer
    x = 1,033.78

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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.