Home / 1,425.20-2,138.52-694.64

Finding the Fourth Proportional to 1,425.20, 2,138.52 and 694.64

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Solution

The fourth proportional to 1,425.20, 2,138.52 and 694.64 is: 1,042.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.20 : 2,138.52 = 694.64 : x
  2. Step 2: Convert to fraction form
    1,425.20/2,138.52 = 694.64/x
  3. Step 3: Cross multiply
    1,425.20x = 2,138.52 × 694.64
  4. Step 4: Simplify right side
    1,425.20x = 1,485,501.53
  5. Step 5: Solve for x
    x = 1,485,501.53/1,425.20
  6. Step 6: Final answer
    x = 1,042.31

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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.