Home / 3,178.74-4,387.05-1,999.79

Finding the Fourth Proportional to 3,178.74, 4,387.05 and 1,999.79

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Solution

The fourth proportional to 3,178.74, 4,387.05 and 1,999.79 is: 2,759.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.74 : 4,387.05 = 1,999.79 : x
  2. Step 2: Convert to fraction form
    3,178.74/4,387.05 = 1,999.79/x
  3. Step 3: Cross multiply
    3,178.74x = 4,387.05 × 1,999.79
  4. Step 4: Simplify right side
    3,178.74x = 8,773,156.78
  5. Step 5: Solve for x
    x = 8,773,156.78/3,178.74
  6. Step 6: Final answer
    x = 2,759.95

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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.