Home / 2,638.40-3,956.74-1,405.12

Finding the Fourth Proportional to 2,638.40, 3,956.74 and 1,405.12

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Solution

The fourth proportional to 2,638.40, 3,956.74 and 1,405.12 is: 2,107.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.40 : 3,956.74 = 1,405.12 : x
  2. Step 2: Convert to fraction form
    2,638.40/3,956.74 = 1,405.12/x
  3. Step 3: Cross multiply
    2,638.40x = 3,956.74 × 1,405.12
  4. Step 4: Simplify right side
    2,638.40x = 5,559,694.51
  5. Step 5: Solve for x
    x = 5,559,694.51/2,638.40
  6. Step 6: Final answer
    x = 2,107.22

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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.