Home / 1,431.82-2,147.25-691.79

Finding the Fourth Proportional to 1,431.82, 2,147.25 and 691.79

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Solution

The fourth proportional to 1,431.82, 2,147.25 and 691.79 is: 1,037.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.82 : 2,147.25 = 691.79 : x
  2. Step 2: Convert to fraction form
    1,431.82/2,147.25 = 691.79/x
  3. Step 3: Cross multiply
    1,431.82x = 2,147.25 × 691.79
  4. Step 4: Simplify right side
    1,431.82x = 1,485,444.98
  5. Step 5: Solve for x
    x = 1,485,444.98/1,431.82
  6. Step 6: Final answer
    x = 1,037.45

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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.