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Finding the Fourth Proportional to 18,291.20, 27,436.80 and 7,198.40

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Solution

The fourth proportional to 18,291.20, 27,436.80 and 7,198.40 is: 10,797.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,291.20 : 27,436.80 = 7,198.40 : x
  2. Step 2: Convert to fraction form
    18,291.20/27,436.80 = 7,198.40/x
  3. Step 3: Cross multiply
    18,291.20x = 27,436.80 × 7,198.40
  4. Step 4: Simplify right side
    18,291.20x = 197,501,061.12
  5. Step 5: Solve for x
    x = 197,501,061.12/18,291.20
  6. Step 6: Final answer
    x = 10,797.60

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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.