Home / 2,129.36-2,939.12-1,290.06

Finding the Fourth Proportional to 2,129.36, 2,939.12 and 1,290.06

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Solution

The fourth proportional to 2,129.36, 2,939.12 and 1,290.06 is: 1,780.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.36 : 2,939.12 = 1,290.06 : x
  2. Step 2: Convert to fraction form
    2,129.36/2,939.12 = 1,290.06/x
  3. Step 3: Cross multiply
    2,129.36x = 2,939.12 × 1,290.06
  4. Step 4: Simplify right side
    2,129.36x = 3,791,641.15
  5. Step 5: Solve for x
    x = 3,791,641.15/2,129.36
  6. Step 6: Final answer
    x = 1,780.65

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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.