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Finding the Fourth Proportional to 646.23, 969.14 and 213.29

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Solution

The fourth proportional to 646.23, 969.14 and 213.29 is: 319.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.23 : 969.14 = 213.29 : x
  2. Step 2: Convert to fraction form
    646.23/969.14 = 213.29/x
  3. Step 3: Cross multiply
    646.23x = 969.14 × 213.29
  4. Step 4: Simplify right side
    646.23x = 206,701.96
  5. Step 5: Solve for x
    x = 206,701.96/646.23
  6. Step 6: Final answer
    x = 319.86

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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.