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Finding the Fourth Proportional to 936.92, 1,402.94 and 628.28

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Solution

The fourth proportional to 936.92, 1,402.94 and 628.28 is: 940.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.92 : 1,402.94 = 628.28 : x
  2. Step 2: Convert to fraction form
    936.92/1,402.94 = 628.28/x
  3. Step 3: Cross multiply
    936.92x = 1,402.94 × 628.28
  4. Step 4: Simplify right side
    936.92x = 881,439.14
  5. Step 5: Solve for x
    x = 881,439.14/936.92
  6. Step 6: Final answer
    x = 940.78

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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.