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Finding the Fourth Proportional to 968.38, 1,335.92 and 636.68

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Solution

The fourth proportional to 968.38, 1,335.92 and 636.68 is: 878.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.38 : 1,335.92 = 636.68 : x
  2. Step 2: Convert to fraction form
    968.38/1,335.92 = 636.68/x
  3. Step 3: Cross multiply
    968.38x = 1,335.92 × 636.68
  4. Step 4: Simplify right side
    968.38x = 850,553.55
  5. Step 5: Solve for x
    x = 850,553.55/968.38
  6. Step 6: Final answer
    x = 878.33

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1.5x scale

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.