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Finding the Fourth Proportional to 1,292.78, 1,939.17 and 512.96

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Solution

The fourth proportional to 1,292.78, 1,939.17 and 512.96 is: 769.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.78 : 1,939.17 = 512.96 : x
  2. Step 2: Convert to fraction form
    1,292.78/1,939.17 = 512.96/x
  3. Step 3: Cross multiply
    1,292.78x = 1,939.17 × 512.96
  4. Step 4: Simplify right side
    1,292.78x = 994,715.45
  5. Step 5: Solve for x
    x = 994,715.45/1,292.78
  6. Step 6: Final answer
    x = 769.44

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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.