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Finding the Fourth Proportional to 2,129.88, 2,939.03 and 1,245.51

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Solution

The fourth proportional to 2,129.88, 2,939.03 and 1,245.51 is: 1,718.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.88 : 2,939.03 = 1,245.51 : x
  2. Step 2: Convert to fraction form
    2,129.88/2,939.03 = 1,245.51/x
  3. Step 3: Cross multiply
    2,129.88x = 2,939.03 × 1,245.51
  4. Step 4: Simplify right side
    2,129.88x = 3,660,585.03
  5. Step 5: Solve for x
    x = 3,660,585.03/2,129.88
  6. Step 6: Final answer
    x = 1,718.68

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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.