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Finding the Fourth Proportional to 2,639.72, 3,958.36 and 790.36

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Solution

The fourth proportional to 2,639.72, 3,958.36 and 790.36 is: 1,185.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.72 : 3,958.36 = 790.36 : x
  2. Step 2: Convert to fraction form
    2,639.72/3,958.36 = 790.36/x
  3. Step 3: Cross multiply
    2,639.72x = 3,958.36 × 790.36
  4. Step 4: Simplify right side
    2,639.72x = 3,128,529.41
  5. Step 5: Solve for x
    x = 3,128,529.41/2,639.72
  6. Step 6: Final answer
    x = 1,185.17

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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.