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Finding the Fourth Proportional to 643.08, 964.12 and 318.24

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Solution

The fourth proportional to 643.08, 964.12 and 318.24 is: 477.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.08 : 964.12 = 318.24 : x
  2. Step 2: Convert to fraction form
    643.08/964.12 = 318.24/x
  3. Step 3: Cross multiply
    643.08x = 964.12 × 318.24
  4. Step 4: Simplify right side
    643.08x = 306,821.55
  5. Step 5: Solve for x
    x = 306,821.55/643.08
  6. Step 6: Final answer
    x = 477.11

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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.