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Finding the Fourth Proportional to 643.96, 964.86 and 401.08

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Solution

The fourth proportional to 643.96, 964.86 and 401.08 is: 600.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.96 : 964.86 = 401.08 : x
  2. Step 2: Convert to fraction form
    643.96/964.86 = 401.08/x
  3. Step 3: Cross multiply
    643.96x = 964.86 × 401.08
  4. Step 4: Simplify right side
    643.96x = 386,986.05
  5. Step 5: Solve for x
    x = 386,986.05/643.96
  6. Step 6: Final answer
    x = 600.95

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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.