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Finding the Fourth Proportional to 939.92, 1,297 and 743.92

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Solution

The fourth proportional to 939.92, 1,297 and 743.92 is: 1,026.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.92 : 1,297 = 743.92 : x
  2. Step 2: Convert to fraction form
    939.92/1,297 = 743.92/x
  3. Step 3: Cross multiply
    939.92x = 1,297 × 743.92
  4. Step 4: Simplify right side
    939.92x = 964,864.24
  5. Step 5: Solve for x
    x = 964,864.24/939.92
  6. Step 6: Final answer
    x = 1,026.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.