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Finding the Fourth Proportional to 13,639.60, 20,430.60 and 11,335.60

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Solution

The fourth proportional to 13,639.60, 20,430.60 and 11,335.60 is: 16,979.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.60 : 20,430.60 = 11,335.60 : x
  2. Step 2: Convert to fraction form
    13,639.60/20,430.60 = 11,335.60/x
  3. Step 3: Cross multiply
    13,639.60x = 20,430.60 × 11,335.60
  4. Step 4: Simplify right side
    13,639.60x = 231,593,109.36
  5. Step 5: Solve for x
    x = 231,593,109.36/13,639.60
  6. Step 6: Final answer
    x = 16,979.46

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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.