Home / 2,143.72-2,958.36-1,212.20

Finding the Fourth Proportional to 2,143.72, 2,958.36 and 1,212.20

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Solution

The fourth proportional to 2,143.72, 2,958.36 and 1,212.20 is: 1,672.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.72 : 2,958.36 = 1,212.20 : x
  2. Step 2: Convert to fraction form
    2,143.72/2,958.36 = 1,212.20/x
  3. Step 3: Cross multiply
    2,143.72x = 2,958.36 × 1,212.20
  4. Step 4: Simplify right side
    2,143.72x = 3,586,123.99
  5. Step 5: Solve for x
    x = 3,586,123.99/2,143.72
  6. Step 6: Final answer
    x = 1,672.85

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1.5x scale

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.