Home / 2,639.31-3,958.96-691.50

Finding the Fourth Proportional to 2,639.31, 3,958.96 and 691.50

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Solution

The fourth proportional to 2,639.31, 3,958.96 and 691.50 is: 1,037.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.31 : 3,958.96 = 691.50 : x
  2. Step 2: Convert to fraction form
    2,639.31/3,958.96 = 691.50/x
  3. Step 3: Cross multiply
    2,639.31x = 3,958.96 × 691.50
  4. Step 4: Simplify right side
    2,639.31x = 2,737,620.84
  5. Step 5: Solve for x
    x = 2,737,620.84/2,639.31
  6. Step 6: Final answer
    x = 1,037.25

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1.5x scale

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.