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Finding the Fourth Proportional to 13,609.60, 20,407.20 and 5,809.60

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Solution

The fourth proportional to 13,609.60, 20,407.20 and 5,809.60 is: 8,711.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.60 : 20,407.20 = 5,809.60 : x
  2. Step 2: Convert to fraction form
    13,609.60/20,407.20 = 5,809.60/x
  3. Step 3: Cross multiply
    13,609.60x = 20,407.20 × 5,809.60
  4. Step 4: Simplify right side
    13,609.60x = 118,557,669.12
  5. Step 5: Solve for x
    x = 118,557,669.12/13,609.60
  6. Step 6: Final answer
    x = 8,711.33

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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.