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Finding the Fourth Proportional to 643.11, 887.58 and 363.45

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Solution

The fourth proportional to 643.11, 887.58 and 363.45 is: 501.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.11 : 887.58 = 363.45 : x
  2. Step 2: Convert to fraction form
    643.11/887.58 = 363.45/x
  3. Step 3: Cross multiply
    643.11x = 887.58 × 363.45
  4. Step 4: Simplify right side
    643.11x = 322,590.95
  5. Step 5: Solve for x
    x = 322,590.95/643.11
  6. Step 6: Final answer
    x = 501.61

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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.