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Finding the Fourth Proportional to 643.25, 887.68 and 363.48

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Solution

The fourth proportional to 643.25, 887.68 and 363.48 is: 501.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.25 : 887.68 = 363.48 : x
  2. Step 2: Convert to fraction form
    643.25/887.68 = 363.48/x
  3. Step 3: Cross multiply
    643.25x = 887.68 × 363.48
  4. Step 4: Simplify right side
    643.25x = 322,653.93
  5. Step 5: Solve for x
    x = 322,653.93/643.25
  6. Step 6: Final answer
    x = 501.60

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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.