Home / 1,638.12-2,451.68-1,115.96

Finding the Fourth Proportional to 1,638.12, 2,451.68 and 1,115.96

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Solution

The fourth proportional to 1,638.12, 2,451.68 and 1,115.96 is: 1,670.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.12 : 2,451.68 = 1,115.96 : x
  2. Step 2: Convert to fraction form
    1,638.12/2,451.68 = 1,115.96/x
  3. Step 3: Cross multiply
    1,638.12x = 2,451.68 × 1,115.96
  4. Step 4: Simplify right side
    1,638.12x = 2,735,976.81
  5. Step 5: Solve for x
    x = 2,735,976.81/1,638.12
  6. Step 6: Final answer
    x = 1,670.19

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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.