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Finding the Fourth Proportional to 643.35, 964.35 and 318.54

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Solution

The fourth proportional to 643.35, 964.35 and 318.54 is: 477.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.35 : 964.35 = 318.54 : x
  2. Step 2: Convert to fraction form
    643.35/964.35 = 318.54/x
  3. Step 3: Cross multiply
    643.35x = 964.35 × 318.54
  4. Step 4: Simplify right side
    643.35x = 307,184.05
  5. Step 5: Solve for x
    x = 307,184.05/643.35
  6. Step 6: Final answer
    x = 477.48

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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.