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Finding the Fourth Proportional to 930.73, 1,284.92 and 636.43

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Solution

The fourth proportional to 930.73, 1,284.92 and 636.43 is: 878.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.73 : 1,284.92 = 636.43 : x
  2. Step 2: Convert to fraction form
    930.73/1,284.92 = 636.43/x
  3. Step 3: Cross multiply
    930.73x = 1,284.92 × 636.43
  4. Step 4: Simplify right side
    930.73x = 817,761.64
  5. Step 5: Solve for x
    x = 817,761.64/930.73
  6. Step 6: Final answer
    x = 878.62

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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.