Home / 1,920.90-2,651.10-1,212.96

Finding the Fourth Proportional to 1,920.90, 2,651.10 and 1,212.96

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Solution

The fourth proportional to 1,920.90, 2,651.10 and 1,212.96 is: 1,674.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.90 : 2,651.10 = 1,212.96 : x
  2. Step 2: Convert to fraction form
    1,920.90/2,651.10 = 1,212.96/x
  3. Step 3: Cross multiply
    1,920.90x = 2,651.10 × 1,212.96
  4. Step 4: Simplify right side
    1,920.90x = 3,215,678.26
  5. Step 5: Solve for x
    x = 3,215,678.26/1,920.90
  6. Step 6: Final answer
    x = 1,674.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.