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Finding the Fourth Proportional to 628.43, 942.72 and 217.52

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Solution

The fourth proportional to 628.43, 942.72 and 217.52 is: 326.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.43 : 942.72 = 217.52 : x
  2. Step 2: Convert to fraction form
    628.43/942.72 = 217.52/x
  3. Step 3: Cross multiply
    628.43x = 942.72 × 217.52
  4. Step 4: Simplify right side
    628.43x = 205,060.45
  5. Step 5: Solve for x
    x = 205,060.45/628.43
  6. Step 6: Final answer
    x = 326.31

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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.