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Finding the Fourth Proportional to 628.81, 942.96 and 217.82

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Solution

The fourth proportional to 628.81, 942.96 and 217.82 is: 326.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.81 : 942.96 = 217.82 : x
  2. Step 2: Convert to fraction form
    628.81/942.96 = 217.82/x
  3. Step 3: Cross multiply
    628.81x = 942.96 × 217.82
  4. Step 4: Simplify right side
    628.81x = 205,395.55
  5. Step 5: Solve for x
    x = 205,395.55/628.81
  6. Step 6: Final answer
    x = 326.64

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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.