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Finding the Fourth Proportional to 980.68, 1,471.22 and 287.40

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Solution

The fourth proportional to 980.68, 1,471.22 and 287.40 is: 431.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.68 : 1,471.22 = 287.40 : x
  2. Step 2: Convert to fraction form
    980.68/1,471.22 = 287.40/x
  3. Step 3: Cross multiply
    980.68x = 1,471.22 × 287.40
  4. Step 4: Simplify right side
    980.68x = 422,828.63
  5. Step 5: Solve for x
    x = 422,828.63/980.68
  6. Step 6: Final answer
    x = 431.16

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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.