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Finding the Fourth Proportional to 643.93, 965.32 and 310.21

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Solution

The fourth proportional to 643.93, 965.32 and 310.21 is: 465.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.93 : 965.32 = 310.21 : x
  2. Step 2: Convert to fraction form
    643.93/965.32 = 310.21/x
  3. Step 3: Cross multiply
    643.93x = 965.32 × 310.21
  4. Step 4: Simplify right side
    643.93x = 299,449.89
  5. Step 5: Solve for x
    x = 299,449.89/643.93
  6. Step 6: Final answer
    x = 465.04

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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.