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Finding the Fourth Proportional to 980.82, 1,353.47 and 538.74

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Solution

The fourth proportional to 980.82, 1,353.47 and 538.74 is: 743.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.82 : 1,353.47 = 538.74 : x
  2. Step 2: Convert to fraction form
    980.82/1,353.47 = 538.74/x
  3. Step 3: Cross multiply
    980.82x = 1,353.47 × 538.74
  4. Step 4: Simplify right side
    980.82x = 729,165.73
  5. Step 5: Solve for x
    x = 729,165.73/980.82
  6. Step 6: Final answer
    x = 743.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.