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Finding the Fourth Proportional to 18,939.20, 28,412.91 and 7,252.42

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Solution

The fourth proportional to 18,939.20, 28,412.91 and 7,252.42 is: 10,880.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.20 : 28,412.91 = 7,252.42 : x
  2. Step 2: Convert to fraction form
    18,939.20/28,412.91 = 7,252.42/x
  3. Step 3: Cross multiply
    18,939.20x = 28,412.91 × 7,252.42
  4. Step 4: Simplify right side
    18,939.20x = 206,062,382.82
  5. Step 5: Solve for x
    x = 206,062,382.82/18,939.20
  6. Step 6: Final answer
    x = 10,880.20

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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.