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Finding the Fourth Proportional to 12,224.80, 18,337.20 and 12,138.40

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Solution

The fourth proportional to 12,224.80, 18,337.20 and 12,138.40 is: 18,207.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,224.80 : 18,337.20 = 12,138.40 : x
  2. Step 2: Convert to fraction form
    12,224.80/18,337.20 = 12,138.40/x
  3. Step 3: Cross multiply
    12,224.80x = 18,337.20 × 12,138.40
  4. Step 4: Simplify right side
    12,224.80x = 222,584,268.48
  5. Step 5: Solve for x
    x = 222,584,268.48/12,224.80
  6. Step 6: Final answer
    x = 18,207.60

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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.