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Finding the Fourth Proportional to 892.20, 1,338.39 and 307.12

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Solution

The fourth proportional to 892.20, 1,338.39 and 307.12 is: 460.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.20 : 1,338.39 = 307.12 : x
  2. Step 2: Convert to fraction form
    892.20/1,338.39 = 307.12/x
  3. Step 3: Cross multiply
    892.20x = 1,338.39 × 307.12
  4. Step 4: Simplify right side
    892.20x = 411,048.61
  5. Step 5: Solve for x
    x = 411,048.61/892.20
  6. Step 6: Final answer
    x = 460.71

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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.