Home / 2,138.79-3,205.56-1,215.12

Finding the Fourth Proportional to 2,138.79, 3,205.56 and 1,215.12

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Solution

The fourth proportional to 2,138.79, 3,205.56 and 1,215.12 is: 1,821.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.79 : 3,205.56 = 1,215.12 : x
  2. Step 2: Convert to fraction form
    2,138.79/3,205.56 = 1,215.12/x
  3. Step 3: Cross multiply
    2,138.79x = 3,205.56 × 1,215.12
  4. Step 4: Simplify right side
    2,138.79x = 3,895,140.07
  5. Step 5: Solve for x
    x = 3,895,140.07/2,138.79
  6. Step 6: Final answer
    x = 1,821.19

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1.5x scale

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.