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Finding the Fourth Proportional to 18,385.60, 27,578.40 and 10,998.40

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Solution

The fourth proportional to 18,385.60, 27,578.40 and 10,998.40 is: 16,497.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,385.60 : 27,578.40 = 10,998.40 : x
  2. Step 2: Convert to fraction form
    18,385.60/27,578.40 = 10,998.40/x
  3. Step 3: Cross multiply
    18,385.60x = 27,578.40 × 10,998.40
  4. Step 4: Simplify right side
    18,385.60x = 303,318,274.56
  5. Step 5: Solve for x
    x = 303,318,274.56/18,385.60
  6. Step 6: Final answer
    x = 16,497.60

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Half scale
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Double scale
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Similar ratio
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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.