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Finding the Fourth Proportional to 13,953.60, 20,930.40 and 12,641.40

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Solution

The fourth proportional to 13,953.60, 20,930.40 and 12,641.40 is: 18,962.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,953.60 : 20,930.40 = 12,641.40 : x
  2. Step 2: Convert to fraction form
    13,953.60/20,930.40 = 12,641.40/x
  3. Step 3: Cross multiply
    13,953.60x = 20,930.40 × 12,641.40
  4. Step 4: Simplify right side
    13,953.60x = 264,589,558.56
  5. Step 5: Solve for x
    x = 264,589,558.56/13,953.60
  6. Step 6: Final answer
    x = 18,962.10

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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.