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Finding the Fourth Proportional to 1,072.43, 1,608.37 and 423.17

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Solution

The fourth proportional to 1,072.43, 1,608.37 and 423.17 is: 634.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.43 : 1,608.37 = 423.17 : x
  2. Step 2: Convert to fraction form
    1,072.43/1,608.37 = 423.17/x
  3. Step 3: Cross multiply
    1,072.43x = 1,608.37 × 423.17
  4. Step 4: Simplify right side
    1,072.43x = 680,604.83
  5. Step 5: Solve for x
    x = 680,604.83/1,072.43
  6. Step 6: Final answer
    x = 634.64

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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.