Home / 2,129.79-2,939.31-1,245.54

Finding the Fourth Proportional to 2,129.79, 2,939.31 and 1,245.54

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Solution

The fourth proportional to 2,129.79, 2,939.31 and 1,245.54 is: 1,718.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.79 : 2,939.31 = 1,245.54 : x
  2. Step 2: Convert to fraction form
    2,129.79/2,939.31 = 1,245.54/x
  3. Step 3: Cross multiply
    2,129.79x = 2,939.31 × 1,245.54
  4. Step 4: Simplify right side
    2,129.79x = 3,661,028.18
  5. Step 5: Solve for x
    x = 3,661,028.18/2,129.79
  6. Step 6: Final answer
    x = 1,718.96

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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.