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Finding the Fourth Proportional to 18,959.19, 28,380.47 and 12,371.19

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Solution

The fourth proportional to 18,959.19, 28,380.47 and 12,371.19 is: 18,518.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.19 : 28,380.47 = 12,371.19 : x
  2. Step 2: Convert to fraction form
    18,959.19/28,380.47 = 12,371.19/x
  3. Step 3: Cross multiply
    18,959.19x = 28,380.47 × 12,371.19
  4. Step 4: Simplify right side
    18,959.19x = 351,100,124.80
  5. Step 5: Solve for x
    x = 351,100,124.80/18,959.19
  6. Step 6: Final answer
    x = 18,518.73

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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.