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Finding the Fourth Proportional to 12,608.80, 18,913.20 and 11,661.10

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Solution

The fourth proportional to 12,608.80, 18,913.20 and 11,661.10 is: 17,491.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,608.80 : 18,913.20 = 11,661.10 : x
  2. Step 2: Convert to fraction form
    12,608.80/18,913.20 = 11,661.10/x
  3. Step 3: Cross multiply
    12,608.80x = 18,913.20 × 11,661.10
  4. Step 4: Simplify right side
    12,608.80x = 220,548,716.52
  5. Step 5: Solve for x
    x = 220,548,716.52/12,608.80
  6. Step 6: Final answer
    x = 17,491.65

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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.