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Finding the Fourth Proportional to 892.78, 1,339.39 and 307.79

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Solution

The fourth proportional to 892.78, 1,339.39 and 307.79 is: 461.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.78 : 1,339.39 = 307.79 : x
  2. Step 2: Convert to fraction form
    892.78/1,339.39 = 307.79/x
  3. Step 3: Cross multiply
    892.78x = 1,339.39 × 307.79
  4. Step 4: Simplify right side
    892.78x = 412,250.85
  5. Step 5: Solve for x
    x = 412,250.85/892.78
  6. Step 6: Final answer
    x = 461.76

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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.