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Finding the Fourth Proportional to 13,358.40, 20,080.80 and 12,321.60

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Solution

The fourth proportional to 13,358.40, 20,080.80 and 12,321.60 is: 18,522.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,358.40 : 20,080.80 = 12,321.60 : x
  2. Step 2: Convert to fraction form
    13,358.40/20,080.80 = 12,321.60/x
  3. Step 3: Cross multiply
    13,358.40x = 20,080.80 × 12,321.60
  4. Step 4: Simplify right side
    13,358.40x = 247,427,585.28
  5. Step 5: Solve for x
    x = 247,427,585.28/13,358.40
  6. Step 6: Final answer
    x = 18,522.25

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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.