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Finding the Fourth Proportional to 643.53, 887.91 and 363.71

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Solution

The fourth proportional to 643.53, 887.91 and 363.71 is: 501.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.53 : 887.91 = 363.71 : x
  2. Step 2: Convert to fraction form
    643.53/887.91 = 363.71/x
  3. Step 3: Cross multiply
    643.53x = 887.91 × 363.71
  4. Step 4: Simplify right side
    643.53x = 322,937.31
  5. Step 5: Solve for x
    x = 322,937.31/643.53
  6. Step 6: Final answer
    x = 501.82

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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.