Home / 2,639.14-3,959.31-1,405.90

Finding the Fourth Proportional to 2,639.14, 3,959.31 and 1,405.90

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Solution

The fourth proportional to 2,639.14, 3,959.31 and 1,405.90 is: 2,109.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.14 : 3,959.31 = 1,405.90 : x
  2. Step 2: Convert to fraction form
    2,639.14/3,959.31 = 1,405.90/x
  3. Step 3: Cross multiply
    2,639.14x = 3,959.31 × 1,405.90
  4. Step 4: Simplify right side
    2,639.14x = 5,566,393.93
  5. Step 5: Solve for x
    x = 5,566,393.93/2,639.14
  6. Step 6: Final answer
    x = 2,109.17

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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.