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Finding the Fourth Proportional to 18,785.70, 28,133.83 and 10,871.54

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Solution

The fourth proportional to 18,785.70, 28,133.83 and 10,871.54 is: 16,281.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,785.70 : 28,133.83 = 10,871.54 : x
  2. Step 2: Convert to fraction form
    18,785.70/28,133.83 = 10,871.54/x
  3. Step 3: Cross multiply
    18,785.70x = 28,133.83 × 10,871.54
  4. Step 4: Simplify right side
    18,785.70x = 305,858,101.35
  5. Step 5: Solve for x
    x = 305,858,101.35/18,785.70
  6. Step 6: Final answer
    x = 16,281.43

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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.