Home / 2,639.13-3,958.67-691.31

Finding the Fourth Proportional to 2,639.13, 3,958.67 and 691.31

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Solution

The fourth proportional to 2,639.13, 3,958.67 and 691.31 is: 1,036.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.13 : 3,958.67 = 691.31 : x
  2. Step 2: Convert to fraction form
    2,639.13/3,958.67 = 691.31/x
  3. Step 3: Cross multiply
    2,639.13x = 3,958.67 × 691.31
  4. Step 4: Simplify right side
    2,639.13x = 2,736,679.78
  5. Step 5: Solve for x
    x = 2,736,679.78/2,639.13
  6. Step 6: Final answer
    x = 1,036.96

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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.