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Finding the Fourth Proportional to 643.80, 888.44 and 349.06

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Solution

The fourth proportional to 643.80, 888.44 and 349.06 is: 481.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.80 : 888.44 = 349.06 : x
  2. Step 2: Convert to fraction form
    643.80/888.44 = 349.06/x
  3. Step 3: Cross multiply
    643.80x = 888.44 × 349.06
  4. Step 4: Simplify right side
    643.80x = 310,118.87
  5. Step 5: Solve for x
    x = 310,118.87/643.80
  6. Step 6: Final answer
    x = 481.70

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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.