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Finding the Fourth Proportional to 1,293, 1,939.64 and 427.28

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Solution

The fourth proportional to 1,293, 1,939.64 and 427.28 is: 640.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293 : 1,939.64 = 427.28 : x
  2. Step 2: Convert to fraction form
    1,293/1,939.64 = 427.28/x
  3. Step 3: Cross multiply
    1,293x = 1,939.64 × 427.28
  4. Step 4: Simplify right side
    1,293x = 828,769.38
  5. Step 5: Solve for x
    x = 828,769.38/1,293
  6. Step 6: Final answer
    x = 640.97

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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.