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Finding the Fourth Proportional to 12,287.80, 18,410.10 and 10,905.40

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Solution

The fourth proportional to 12,287.80, 18,410.10 and 10,905.40 is: 16,338.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,287.80 : 18,410.10 = 10,905.40 : x
  2. Step 2: Convert to fraction form
    12,287.80/18,410.10 = 10,905.40/x
  3. Step 3: Cross multiply
    12,287.80x = 18,410.10 × 10,905.40
  4. Step 4: Simplify right side
    12,287.80x = 200,769,504.54
  5. Step 5: Solve for x
    x = 200,769,504.54/12,287.80
  6. Step 6: Final answer
    x = 16,338.93

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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.