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Finding the Fourth Proportional to 643.45, 887.98 and 363.74

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Solution

The fourth proportional to 643.45, 887.98 and 363.74 is: 501.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.45 : 887.98 = 363.74 : x
  2. Step 2: Convert to fraction form
    643.45/887.98 = 363.74/x
  3. Step 3: Cross multiply
    643.45x = 887.98 × 363.74
  4. Step 4: Simplify right side
    643.45x = 322,993.85
  5. Step 5: Solve for x
    x = 322,993.85/643.45
  6. Step 6: Final answer
    x = 501.97

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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.