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Finding the Fourth Proportional to 13,809.40, 20,714.10 and 12,081.40

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Solution

The fourth proportional to 13,809.40, 20,714.10 and 12,081.40 is: 18,122.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,809.40 : 20,714.10 = 12,081.40 : x
  2. Step 2: Convert to fraction form
    13,809.40/20,714.10 = 12,081.40/x
  3. Step 3: Cross multiply
    13,809.40x = 20,714.10 × 12,081.40
  4. Step 4: Simplify right side
    13,809.40x = 250,255,327.74
  5. Step 5: Solve for x
    x = 250,255,327.74/13,809.40
  6. Step 6: Final answer
    x = 18,122.10

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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.