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Finding the Fourth Proportional to 1,072.38, 1,604.34 and 813.12

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Solution

The fourth proportional to 1,072.38, 1,604.34 and 813.12 is: 1,216.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.38 : 1,604.34 = 813.12 : x
  2. Step 2: Convert to fraction form
    1,072.38/1,604.34 = 813.12/x
  3. Step 3: Cross multiply
    1,072.38x = 1,604.34 × 813.12
  4. Step 4: Simplify right side
    1,072.38x = 1,304,520.94
  5. Step 5: Solve for x
    x = 1,304,520.94/1,072.38
  6. Step 6: Final answer
    x = 1,216.47

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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.