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Finding the Fourth Proportional to 12,661.20, 18,991.80 and 3,427.20

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Solution

The fourth proportional to 12,661.20, 18,991.80 and 3,427.20 is: 5,140.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.20 : 18,991.80 = 3,427.20 : x
  2. Step 2: Convert to fraction form
    12,661.20/18,991.80 = 3,427.20/x
  3. Step 3: Cross multiply
    12,661.20x = 18,991.80 × 3,427.20
  4. Step 4: Simplify right side
    12,661.20x = 65,088,696.96
  5. Step 5: Solve for x
    x = 65,088,696.96/12,661.20
  6. Step 6: Final answer
    x = 5,140.80

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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.