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Finding the Fourth Proportional to 628.50, 942.39 and 217.47

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Solution

The fourth proportional to 628.50, 942.39 and 217.47 is: 326.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.50 : 942.39 = 217.47 : x
  2. Step 2: Convert to fraction form
    628.50/942.39 = 217.47/x
  3. Step 3: Cross multiply
    628.50x = 942.39 × 217.47
  4. Step 4: Simplify right side
    628.50x = 204,941.55
  5. Step 5: Solve for x
    x = 204,941.55/628.50
  6. Step 6: Final answer
    x = 326.08

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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.