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Finding the Fourth Proportional to 18,758.74, 28,145.88 and 8,223.30

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Solution

The fourth proportional to 18,758.74, 28,145.88 and 8,223.30 is: 12,338.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,758.74 : 28,145.88 = 8,223.30 : x
  2. Step 2: Convert to fraction form
    18,758.74/28,145.88 = 8,223.30/x
  3. Step 3: Cross multiply
    18,758.74x = 28,145.88 × 8,223.30
  4. Step 4: Simplify right side
    18,758.74x = 231,452,015.00
  5. Step 5: Solve for x
    x = 231,452,015.00/18,758.74
  6. Step 6: Final answer
    x = 12,338.36

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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.