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Finding the Fourth Proportional to 628.89, 943.43 and 218.15

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Solution

The fourth proportional to 628.89, 943.43 and 218.15 is: 327.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.89 : 943.43 = 218.15 : x
  2. Step 2: Convert to fraction form
    628.89/943.43 = 218.15/x
  3. Step 3: Cross multiply
    628.89x = 943.43 × 218.15
  4. Step 4: Simplify right side
    628.89x = 205,809.25
  5. Step 5: Solve for x
    x = 205,809.25/628.89
  6. Step 6: Final answer
    x = 327.26

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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.