Home / 2,178.43-3,005.21-1,338.80

Finding the Fourth Proportional to 2,178.43, 3,005.21 and 1,338.80

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Solution

The fourth proportional to 2,178.43, 3,005.21 and 1,338.80 is: 1,846.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,178.43 : 3,005.21 = 1,338.80 : x
  2. Step 2: Convert to fraction form
    2,178.43/3,005.21 = 1,338.80/x
  3. Step 3: Cross multiply
    2,178.43x = 3,005.21 × 1,338.80
  4. Step 4: Simplify right side
    2,178.43x = 4,023,363.47
  5. Step 5: Solve for x
    x = 4,023,363.47/2,178.43
  6. Step 6: Final answer
    x = 1,846.91

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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.