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Finding the Fourth Proportional to 643, 886.92 and 422.14

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Solution

The fourth proportional to 643, 886.92 and 422.14 is: 582.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    643 : 886.92 = 422.14 : x
  2. Step 2: Convert to fraction form
    643/886.92 = 422.14/x
  3. Step 3: Cross multiply
    643x = 886.92 × 422.14
  4. Step 4: Simplify right side
    643x = 374,404.41
  5. Step 5: Solve for x
    x = 374,404.41/643
  6. Step 6: Final answer
    x = 582.28

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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.