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Finding the Fourth Proportional to 892.20, 1,338.38 and 315.08

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Solution

The fourth proportional to 892.20, 1,338.38 and 315.08 is: 472.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.20 : 1,338.38 = 315.08 : x
  2. Step 2: Convert to fraction form
    892.20/1,338.38 = 315.08/x
  3. Step 3: Cross multiply
    892.20x = 1,338.38 × 315.08
  4. Step 4: Simplify right side
    892.20x = 421,696.77
  5. Step 5: Solve for x
    x = 421,696.77/892.20
  6. Step 6: Final answer
    x = 472.65

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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.