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Finding the Fourth Proportional to 13,390.40, 20,085.60 and 11,662.40

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Solution

The fourth proportional to 13,390.40, 20,085.60 and 11,662.40 is: 17,493.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.40 : 20,085.60 = 11,662.40 : x
  2. Step 2: Convert to fraction form
    13,390.40/20,085.60 = 11,662.40/x
  3. Step 3: Cross multiply
    13,390.40x = 20,085.60 × 11,662.40
  4. Step 4: Simplify right side
    13,390.40x = 234,246,301.44
  5. Step 5: Solve for x
    x = 234,246,301.44/13,390.40
  6. Step 6: Final answer
    x = 17,493.60

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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.