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Finding the Fourth Proportional to 643.28, 893.98 and 636.24

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Solution

The fourth proportional to 643.28, 893.98 and 636.24 is: 884.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.28 : 893.98 = 636.24 : x
  2. Step 2: Convert to fraction form
    643.28/893.98 = 636.24/x
  3. Step 3: Cross multiply
    643.28x = 893.98 × 636.24
  4. Step 4: Simplify right side
    643.28x = 568,785.84
  5. Step 5: Solve for x
    x = 568,785.84/643.28
  6. Step 6: Final answer
    x = 884.20

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.