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Finding the Fourth Proportional to 643.39, 888.03 and 377.89

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Solution

The fourth proportional to 643.39, 888.03 and 377.89 is: 521.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.39 : 888.03 = 377.89 : x
  2. Step 2: Convert to fraction form
    643.39/888.03 = 377.89/x
  3. Step 3: Cross multiply
    643.39x = 888.03 × 377.89
  4. Step 4: Simplify right side
    643.39x = 335,575.44
  5. Step 5: Solve for x
    x = 335,575.44/643.39
  6. Step 6: Final answer
    x = 521.58

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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.