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Finding the Fourth Proportional to 643.38, 965.88 and 435.84

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Solution

The fourth proportional to 643.38, 965.88 and 435.84 is: 654.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.38 : 965.88 = 435.84 : x
  2. Step 2: Convert to fraction form
    643.38/965.88 = 435.84/x
  3. Step 3: Cross multiply
    643.38x = 965.88 × 435.84
  4. Step 4: Simplify right side
    643.38x = 420,969.14
  5. Step 5: Solve for x
    x = 420,969.14/643.38
  6. Step 6: Final answer
    x = 654.31

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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.