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Finding the Fourth Proportional to 643.56, 888.10 and 348.82

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Solution

The fourth proportional to 643.56, 888.10 and 348.82 is: 481.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.56 : 888.10 = 348.82 : x
  2. Step 2: Convert to fraction form
    643.56/888.10 = 348.82/x
  3. Step 3: Cross multiply
    643.56x = 888.10 × 348.82
  4. Step 4: Simplify right side
    643.56x = 309,787.04
  5. Step 5: Solve for x
    x = 309,787.04/643.56
  6. Step 6: Final answer
    x = 481.37

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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.