Home / 18,919.11-28,382.31-6,438.63

Finding the Fourth Proportional to 18,919.11, 28,382.31 and 6,438.63

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Solution

The fourth proportional to 18,919.11, 28,382.31 and 6,438.63 is: 9,659.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.11 : 28,382.31 = 6,438.63 : x
  2. Step 2: Convert to fraction form
    18,919.11/28,382.31 = 6,438.63/x
  3. Step 3: Cross multiply
    18,919.11x = 28,382.31 × 6,438.63
  4. Step 4: Simplify right side
    18,919.11x = 182,743,192.64
  5. Step 5: Solve for x
    x = 182,743,192.64/18,919.11
  6. Step 6: Final answer
    x = 9,659.19

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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.