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Finding the Fourth Proportional to 643.83, 965.63 and 335.31

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Solution

The fourth proportional to 643.83, 965.63 and 335.31 is: 502.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.83 : 965.63 = 335.31 : x
  2. Step 2: Convert to fraction form
    643.83/965.63 = 335.31/x
  3. Step 3: Cross multiply
    643.83x = 965.63 × 335.31
  4. Step 4: Simplify right side
    643.83x = 323,783.72
  5. Step 5: Solve for x
    x = 323,783.72/643.83
  6. Step 6: Final answer
    x = 502.90

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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.