Home / 1,914.70-2,872.90-1,221.20

Finding the Fourth Proportional to 1,914.70, 2,872.90 and 1,221.20

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Solution

The fourth proportional to 1,914.70, 2,872.90 and 1,221.20 is: 1,832.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,914.70 : 2,872.90 = 1,221.20 : x
  2. Step 2: Convert to fraction form
    1,914.70/2,872.90 = 1,221.20/x
  3. Step 3: Cross multiply
    1,914.70x = 2,872.90 × 1,221.20
  4. Step 4: Simplify right side
    1,914.70x = 3,508,385.48
  5. Step 5: Solve for x
    x = 3,508,385.48/1,914.70
  6. Step 6: Final answer
    x = 1,832.34

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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.