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Finding the Fourth Proportional to 980.65, 1,471.17 and 287.32

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Solution

The fourth proportional to 980.65, 1,471.17 and 287.32 is: 431.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.65 : 1,471.17 = 287.32 : x
  2. Step 2: Convert to fraction form
    980.65/1,471.17 = 287.32/x
  3. Step 3: Cross multiply
    980.65x = 1,471.17 × 287.32
  4. Step 4: Simplify right side
    980.65x = 422,696.56
  5. Step 5: Solve for x
    x = 422,696.56/980.65
  6. Step 6: Final answer
    x = 431.04

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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.