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Finding the Fourth Proportional to 646.08, 969 and 213.18

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Solution

The fourth proportional to 646.08, 969 and 213.18 is: 319.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.08 : 969 = 213.18 : x
  2. Step 2: Convert to fraction form
    646.08/969 = 213.18/x
  3. Step 3: Cross multiply
    646.08x = 969 × 213.18
  4. Step 4: Simplify right side
    646.08x = 206,571.42
  5. Step 5: Solve for x
    x = 206,571.42/646.08
  6. Step 6: Final answer
    x = 319.73

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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.