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Finding the Fourth Proportional to 21,228.80, 31,843.20 and 13,446.40

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Solution

The fourth proportional to 21,228.80, 31,843.20 and 13,446.40 is: 20,169.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,228.80 : 31,843.20 = 13,446.40 : x
  2. Step 2: Convert to fraction form
    21,228.80/31,843.20 = 13,446.40/x
  3. Step 3: Cross multiply
    21,228.80x = 31,843.20 × 13,446.40
  4. Step 4: Simplify right side
    21,228.80x = 428,176,404.48
  5. Step 5: Solve for x
    x = 428,176,404.48/21,228.80
  6. Step 6: Final answer
    x = 20,169.60

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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.