Home / 20,129.46-30,178.31-12,718.30

Finding the Fourth Proportional to 20,129.46, 30,178.31 and 12,718.30

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Solution

The fourth proportional to 20,129.46, 30,178.31 and 12,718.30 is: 19,067.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.46 : 30,178.31 = 12,718.30 : x
  2. Step 2: Convert to fraction form
    20,129.46/30,178.31 = 12,718.30/x
  3. Step 3: Cross multiply
    20,129.46x = 30,178.31 × 12,718.30
  4. Step 4: Simplify right side
    20,129.46x = 383,816,800.07
  5. Step 5: Solve for x
    x = 383,816,800.07/20,129.46
  6. Step 6: Final answer
    x = 19,067.42

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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.