Home / 12,387.21-18,580.80-4,179.21

Finding the Fourth Proportional to 12,387.21, 18,580.80 and 4,179.21

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Solution

The fourth proportional to 12,387.21, 18,580.80 and 4,179.21 is: 6,268.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,387.21 : 18,580.80 = 4,179.21 : x
  2. Step 2: Convert to fraction form
    12,387.21/18,580.80 = 4,179.21/x
  3. Step 3: Cross multiply
    12,387.21x = 18,580.80 × 4,179.21
  4. Step 4: Simplify right side
    12,387.21x = 77,653,065.17
  5. Step 5: Solve for x
    x = 77,653,065.17/12,387.21
  6. Step 6: Final answer
    x = 6,268.81

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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.