Home / 2,129.80-2,939.13-1,198.30

Finding the Fourth Proportional to 2,129.80, 2,939.13 and 1,198.30

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Solution

The fourth proportional to 2,129.80, 2,939.13 and 1,198.30 is: 1,653.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.80 : 2,939.13 = 1,198.30 : x
  2. Step 2: Convert to fraction form
    2,129.80/2,939.13 = 1,198.30/x
  3. Step 3: Cross multiply
    2,129.80x = 2,939.13 × 1,198.30
  4. Step 4: Simplify right side
    2,129.80x = 3,521,959.48
  5. Step 5: Solve for x
    x = 3,521,959.48/2,129.80
  6. Step 6: Final answer
    x = 1,653.66

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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.