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Finding the Fourth Proportional to 20,398, 30,439.31 and 18,189.10

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Solution

The fourth proportional to 20,398, 30,439.31 and 18,189.10 is: 27,143.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,398 : 30,439.31 = 18,189.10 : x
  2. Step 2: Convert to fraction form
    20,398/30,439.31 = 18,189.10/x
  3. Step 3: Cross multiply
    20,398x = 30,439.31 × 18,189.10
  4. Step 4: Simplify right side
    20,398x = 553,663,653.52
  5. Step 5: Solve for x
    x = 553,663,653.52/20,398
  6. Step 6: Final answer
    x = 27,143.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.