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Finding the Fourth Proportional to 677.97, 1,021.97 and 638.33

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Solution

The fourth proportional to 677.97, 1,021.97 and 638.33 is: 962.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.97 : 1,021.97 = 638.33 : x
  2. Step 2: Convert to fraction form
    677.97/1,021.97 = 638.33/x
  3. Step 3: Cross multiply
    677.97x = 1,021.97 × 638.33
  4. Step 4: Simplify right side
    677.97x = 652,352.75
  5. Step 5: Solve for x
    x = 652,352.75/677.97
  6. Step 6: Final answer
    x = 962.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.