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Finding the Fourth Proportional to 628.44, 942.72 and 217.53

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Solution

The fourth proportional to 628.44, 942.72 and 217.53 is: 326.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.44 : 942.72 = 217.53 : x
  2. Step 2: Convert to fraction form
    628.44/942.72 = 217.53/x
  3. Step 3: Cross multiply
    628.44x = 942.72 × 217.53
  4. Step 4: Simplify right side
    628.44x = 205,069.88
  5. Step 5: Solve for x
    x = 205,069.88/628.44
  6. Step 6: Final answer
    x = 326.32

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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.