Home / 2,139.41-3,209.55-1,215.41

Finding the Fourth Proportional to 2,139.41, 3,209.55 and 1,215.41

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Solution

The fourth proportional to 2,139.41, 3,209.55 and 1,215.41 is: 1,823.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.41 : 3,209.55 = 1,215.41 : x
  2. Step 2: Convert to fraction form
    2,139.41/3,209.55 = 1,215.41/x
  3. Step 3: Cross multiply
    2,139.41x = 3,209.55 × 1,215.41
  4. Step 4: Simplify right side
    2,139.41x = 3,900,919.17
  5. Step 5: Solve for x
    x = 3,900,919.17/2,139.41
  6. Step 6: Final answer
    x = 1,823.36

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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.