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Finding the Fourth Proportional to 12,381.80, 18,615.90 and 12,122.60

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Solution

The fourth proportional to 12,381.80, 18,615.90 and 12,122.60 is: 18,226.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,381.80 : 18,615.90 = 12,122.60 : x
  2. Step 2: Convert to fraction form
    12,381.80/18,615.90 = 12,122.60/x
  3. Step 3: Cross multiply
    12,381.80x = 18,615.90 × 12,122.60
  4. Step 4: Simplify right side
    12,381.80x = 225,673,109.34
  5. Step 5: Solve for x
    x = 225,673,109.34/12,381.80
  6. Step 6: Final answer
    x = 18,226.20

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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.