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Finding the Fourth Proportional to 643.43, 887.94 and 348.70

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Solution

The fourth proportional to 643.43, 887.94 and 348.70 is: 481.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.43 : 887.94 = 348.70 : x
  2. Step 2: Convert to fraction form
    643.43/887.94 = 348.70/x
  3. Step 3: Cross multiply
    643.43x = 887.94 × 348.70
  4. Step 4: Simplify right side
    643.43x = 309,626.03
  5. Step 5: Solve for x
    x = 309,626.03/643.43
  6. Step 6: Final answer
    x = 481.21

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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.