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Finding the Fourth Proportional to 643.75, 888.38 and 363.99

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Solution

The fourth proportional to 643.75, 888.38 and 363.99 is: 502.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.75 : 888.38 = 363.99 : x
  2. Step 2: Convert to fraction form
    643.75/888.38 = 363.99/x
  3. Step 3: Cross multiply
    643.75x = 888.38 × 363.99
  4. Step 4: Simplify right side
    643.75x = 323,359.22
  5. Step 5: Solve for x
    x = 323,359.22/643.75
  6. Step 6: Final answer
    x = 502.31

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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.