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Finding the Fourth Proportional to 13,922.40, 20,905.20 and 8,090.40

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Solution

The fourth proportional to 13,922.40, 20,905.20 and 8,090.40 is: 12,148.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,922.40 : 20,905.20 = 8,090.40 : x
  2. Step 2: Convert to fraction form
    13,922.40/20,905.20 = 8,090.40/x
  3. Step 3: Cross multiply
    13,922.40x = 20,905.20 × 8,090.40
  4. Step 4: Simplify right side
    13,922.40x = 169,131,430.08
  5. Step 5: Solve for x
    x = 169,131,430.08/13,922.40
  6. Step 6: Final answer
    x = 12,148.15

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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.