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Finding the Fourth Proportional to 643.77, 965.79 and 210.96

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Solution

The fourth proportional to 643.77, 965.79 and 210.96 is: 316.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.77 : 965.79 = 210.96 : x
  2. Step 2: Convert to fraction form
    643.77/965.79 = 210.96/x
  3. Step 3: Cross multiply
    643.77x = 965.79 × 210.96
  4. Step 4: Simplify right side
    643.77x = 203,743.06
  5. Step 5: Solve for x
    x = 203,743.06/643.77
  6. Step 6: Final answer
    x = 316.48

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