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Finding the Fourth Proportional to 13,412.60, 20,118.90 and 12,843.80

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Solution

The fourth proportional to 13,412.60, 20,118.90 and 12,843.80 is: 19,265.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,412.60 : 20,118.90 = 12,843.80 : x
  2. Step 2: Convert to fraction form
    13,412.60/20,118.90 = 12,843.80/x
  3. Step 3: Cross multiply
    13,412.60x = 20,118.90 × 12,843.80
  4. Step 4: Simplify right side
    13,412.60x = 258,403,127.82
  5. Step 5: Solve for x
    x = 258,403,127.82/13,412.60
  6. Step 6: Final answer
    x = 19,265.70

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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.