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Finding the Fourth Proportional to 2,160.39, 3,240.90 and 843.90

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Solution

The fourth proportional to 2,160.39, 3,240.90 and 843.90 is: 1,265.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.39 : 3,240.90 = 843.90 : x
  2. Step 2: Convert to fraction form
    2,160.39/3,240.90 = 843.90/x
  3. Step 3: Cross multiply
    2,160.39x = 3,240.90 × 843.90
  4. Step 4: Simplify right side
    2,160.39x = 2,734,995.51
  5. Step 5: Solve for x
    x = 2,734,995.51/2,160.39
  6. Step 6: Final answer
    x = 1,265.97

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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.