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Finding the Fourth Proportional to 643.84, 888.51 and 349.11

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Solution

The fourth proportional to 643.84, 888.51 and 349.11 is: 481.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.84 : 888.51 = 349.11 : x
  2. Step 2: Convert to fraction form
    643.84/888.51 = 349.11/x
  3. Step 3: Cross multiply
    643.84x = 888.51 × 349.11
  4. Step 4: Simplify right side
    643.84x = 310,189.95
  5. Step 5: Solve for x
    x = 310,189.95/643.84
  6. Step 6: Final answer
    x = 481.78

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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.