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Finding the Fourth Proportional to 980.82, 1,471.38 and 287.55

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Solution

The fourth proportional to 980.82, 1,471.38 and 287.55 is: 431.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.82 : 1,471.38 = 287.55 : x
  2. Step 2: Convert to fraction form
    980.82/1,471.38 = 287.55/x
  3. Step 3: Cross multiply
    980.82x = 1,471.38 × 287.55
  4. Step 4: Simplify right side
    980.82x = 423,095.32
  5. Step 5: Solve for x
    x = 423,095.32/980.82
  6. Step 6: Final answer
    x = 431.37

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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.