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Finding the Fourth Proportional to 647.97, 888.38 and 636.30

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Solution

The fourth proportional to 647.97, 888.38 and 636.30 is: 872.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.97 : 888.38 = 636.30 : x
  2. Step 2: Convert to fraction form
    647.97/888.38 = 636.30/x
  3. Step 3: Cross multiply
    647.97x = 888.38 × 636.30
  4. Step 4: Simplify right side
    647.97x = 565,274.60
  5. Step 5: Solve for x
    x = 565,274.60/647.97
  6. Step 6: Final answer
    x = 872.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.