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Finding the Fourth Proportional to 967.94, 1,335.86 and 636.45

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Solution

The fourth proportional to 967.94, 1,335.86 and 636.45 is: 878.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.94 : 1,335.86 = 636.45 : x
  2. Step 2: Convert to fraction form
    967.94/1,335.86 = 636.45/x
  3. Step 3: Cross multiply
    967.94x = 1,335.86 × 636.45
  4. Step 4: Simplify right side
    967.94x = 850,208.10
  5. Step 5: Solve for x
    x = 850,208.10/967.94
  6. Step 6: Final answer
    x = 878.37

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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.