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Finding the Fourth Proportional to 1,425.05, 2,138.18 and 694.63

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Solution

The fourth proportional to 1,425.05, 2,138.18 and 694.63 is: 1,042.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.05 : 2,138.18 = 694.63 : x
  2. Step 2: Convert to fraction form
    1,425.05/2,138.18 = 694.63/x
  3. Step 3: Cross multiply
    1,425.05x = 2,138.18 × 694.63
  4. Step 4: Simplify right side
    1,425.05x = 1,485,243.97
  5. Step 5: Solve for x
    x = 1,485,243.97/1,425.05
  6. Step 6: Final answer
    x = 1,042.24

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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.