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Finding the Fourth Proportional to 18,976.21, 28,476.90 and 7,882.87

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Solution

The fourth proportional to 18,976.21, 28,476.90 and 7,882.87 is: 11,829.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,976.21 : 28,476.90 = 7,882.87 : x
  2. Step 2: Convert to fraction form
    18,976.21/28,476.90 = 7,882.87/x
  3. Step 3: Cross multiply
    18,976.21x = 28,476.90 × 7,882.87
  4. Step 4: Simplify right side
    18,976.21x = 224,479,700.70
  5. Step 5: Solve for x
    x = 224,479,700.70/18,976.21
  6. Step 6: Final answer
    x = 11,829.53

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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.