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Finding the Fourth Proportional to 18,939.21, 28,408.80 and 7,252.42

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Solution

The fourth proportional to 18,939.21, 28,408.80 and 7,252.42 is: 10,878.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.21 : 28,408.80 = 7,252.42 : x
  2. Step 2: Convert to fraction form
    18,939.21/28,408.80 = 7,252.42/x
  3. Step 3: Cross multiply
    18,939.21x = 28,408.80 × 7,252.42
  4. Step 4: Simplify right side
    18,939.21x = 206,032,549.30
  5. Step 5: Solve for x
    x = 206,032,549.30/18,939.21
  6. Step 6: Final answer
    x = 10,878.62

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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.