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Finding the Fourth Proportional to 2,639.91, 3,959.64 and 791.45

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Solution

The fourth proportional to 2,639.91, 3,959.64 and 791.45 is: 1,187.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.91 : 3,959.64 = 791.45 : x
  2. Step 2: Convert to fraction form
    2,639.91/3,959.64 = 791.45/x
  3. Step 3: Cross multiply
    2,639.91x = 3,959.64 × 791.45
  4. Step 4: Simplify right side
    2,639.91x = 3,133,852.13
  5. Step 5: Solve for x
    x = 3,133,852.13/2,639.91
  6. Step 6: Final answer
    x = 1,187.10

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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.