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Finding the Fourth Proportional to 968.28, 1,336.59 and 636.99

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Solution

The fourth proportional to 968.28, 1,336.59 and 636.99 is: 879.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.28 : 1,336.59 = 636.99 : x
  2. Step 2: Convert to fraction form
    968.28/1,336.59 = 636.99/x
  3. Step 3: Cross multiply
    968.28x = 1,336.59 × 636.99
  4. Step 4: Simplify right side
    968.28x = 851,394.46
  5. Step 5: Solve for x
    x = 851,394.46/968.28
  6. Step 6: Final answer
    x = 879.29

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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.