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Finding the Fourth Proportional to 643.75, 968.83 and 490.66

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Solution

The fourth proportional to 643.75, 968.83 and 490.66 is: 738.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.75 : 968.83 = 490.66 : x
  2. Step 2: Convert to fraction form
    643.75/968.83 = 490.66/x
  3. Step 3: Cross multiply
    643.75x = 968.83 × 490.66
  4. Step 4: Simplify right side
    643.75x = 475,362.48
  5. Step 5: Solve for x
    x = 475,362.48/643.75
  6. Step 6: Final answer
    x = 738.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.