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Finding the Fourth Proportional to 2,639.10, 3,958.90 and 691.32

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Solution

The fourth proportional to 2,639.10, 3,958.90 and 691.32 is: 1,037.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.10 : 3,958.90 = 691.32 : x
  2. Step 2: Convert to fraction form
    2,639.10/3,958.90 = 691.32/x
  3. Step 3: Cross multiply
    2,639.10x = 3,958.90 × 691.32
  4. Step 4: Simplify right side
    2,639.10x = 2,736,866.75
  5. Step 5: Solve for x
    x = 2,736,866.75/2,639.10
  6. Step 6: Final answer
    x = 1,037.05

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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.