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Finding the Fourth Proportional to 646.13, 969.21 and 213.32

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Solution

The fourth proportional to 646.13, 969.21 and 213.32 is: 319.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.13 : 969.21 = 213.32 : x
  2. Step 2: Convert to fraction form
    646.13/969.21 = 213.32/x
  3. Step 3: Cross multiply
    646.13x = 969.21 × 213.32
  4. Step 4: Simplify right side
    646.13x = 206,747.03
  5. Step 5: Solve for x
    x = 206,747.03/646.13
  6. Step 6: Final answer
    x = 319.98

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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.