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Finding the Fourth Proportional to 643.67, 887.76 and 422.24

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Solution

The fourth proportional to 643.67, 887.76 and 422.24 is: 582.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.67 : 887.76 = 422.24 : x
  2. Step 2: Convert to fraction form
    643.67/887.76 = 422.24/x
  3. Step 3: Cross multiply
    643.67x = 887.76 × 422.24
  4. Step 4: Simplify right side
    643.67x = 374,843.34
  5. Step 5: Solve for x
    x = 374,843.34/643.67
  6. Step 6: Final answer
    x = 582.36

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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.