Home / 12,878.15-19,310.13-3,991.02

Finding the Fourth Proportional to 12,878.15, 19,310.13 and 3,991.02

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Solution

The fourth proportional to 12,878.15, 19,310.13 and 3,991.02 is: 5,984.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,878.15 : 19,310.13 = 3,991.02 : x
  2. Step 2: Convert to fraction form
    12,878.15/19,310.13 = 3,991.02/x
  3. Step 3: Cross multiply
    12,878.15x = 19,310.13 × 3,991.02
  4. Step 4: Simplify right side
    12,878.15x = 77,067,086.61
  5. Step 5: Solve for x
    x = 77,067,086.61/12,878.15
  6. Step 6: Final answer
    x = 5,984.33

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1.5x scale

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.