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Finding the Fourth Proportional to 2,129.42, 2,939.04 and 1,245.44

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Solution

The fourth proportional to 2,129.42, 2,939.04 and 1,245.44 is: 1,718.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.42 : 2,939.04 = 1,245.44 : x
  2. Step 2: Convert to fraction form
    2,129.42/2,939.04 = 1,245.44/x
  3. Step 3: Cross multiply
    2,129.42x = 2,939.04 × 1,245.44
  4. Step 4: Simplify right side
    2,129.42x = 3,660,405.33
  5. Step 5: Solve for x
    x = 3,660,405.33/2,129.42
  6. Step 6: Final answer
    x = 1,718.97

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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.