Home / 2,139.25-3,206.44-905.89

Finding the Fourth Proportional to 2,139.25, 3,206.44 and 905.89

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Solution

The fourth proportional to 2,139.25, 3,206.44 and 905.89 is: 1,357.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.25 : 3,206.44 = 905.89 : x
  2. Step 2: Convert to fraction form
    2,139.25/3,206.44 = 905.89/x
  3. Step 3: Cross multiply
    2,139.25x = 3,206.44 × 905.89
  4. Step 4: Simplify right side
    2,139.25x = 2,904,681.93
  5. Step 5: Solve for x
    x = 2,904,681.93/2,139.25
  6. Step 6: Final answer
    x = 1,357.80

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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.