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Finding the Fourth Proportional to 13,939.20, 20,908.80 and 13,334.40

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Solution

The fourth proportional to 13,939.20, 20,908.80 and 13,334.40 is: 20,001.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,939.20 : 20,908.80 = 13,334.40 : x
  2. Step 2: Convert to fraction form
    13,939.20/20,908.80 = 13,334.40/x
  3. Step 3: Cross multiply
    13,939.20x = 20,908.80 × 13,334.40
  4. Step 4: Simplify right side
    13,939.20x = 278,806,302.72
  5. Step 5: Solve for x
    x = 278,806,302.72/13,939.20
  6. Step 6: Final answer
    x = 20,001.60

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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.