Home / 2,100.79-3,151.02-1,278.86

Finding the Fourth Proportional to 2,100.79, 3,151.02 and 1,278.86

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Solution

The fourth proportional to 2,100.79, 3,151.02 and 1,278.86 is: 1,918.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.79 : 3,151.02 = 1,278.86 : x
  2. Step 2: Convert to fraction form
    2,100.79/3,151.02 = 1,278.86/x
  3. Step 3: Cross multiply
    2,100.79x = 3,151.02 × 1,278.86
  4. Step 4: Simplify right side
    2,100.79x = 4,029,713.44
  5. Step 5: Solve for x
    x = 4,029,713.44/2,100.79
  6. Step 6: Final answer
    x = 1,918.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.