Home / 18,921.45-28,382.18-7,815.94

Finding the Fourth Proportional to 18,921.45, 28,382.18 and 7,815.94

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Solution

The fourth proportional to 18,921.45, 28,382.18 and 7,815.94 is: 11,723.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.45 : 28,382.18 = 7,815.94 : x
  2. Step 2: Convert to fraction form
    18,921.45/28,382.18 = 7,815.94/x
  3. Step 3: Cross multiply
    18,921.45x = 28,382.18 × 7,815.94
  4. Step 4: Simplify right side
    18,921.45x = 221,833,305.91
  5. Step 5: Solve for x
    x = 221,833,305.91/18,921.45
  6. Step 6: Final answer
    x = 11,723.91

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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.