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Finding the Fourth Proportional to 12,655.26, 18,982.90 and 3,421.26

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Solution

The fourth proportional to 12,655.26, 18,982.90 and 3,421.26 is: 5,131.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,655.26 : 18,982.90 = 3,421.26 : x
  2. Step 2: Convert to fraction form
    12,655.26/18,982.90 = 3,421.26/x
  3. Step 3: Cross multiply
    12,655.26x = 18,982.90 × 3,421.26
  4. Step 4: Simplify right side
    12,655.26x = 64,945,436.45
  5. Step 5: Solve for x
    x = 64,945,436.45/12,655.26
  6. Step 6: Final answer
    x = 5,131.89

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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.