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Finding the Fourth Proportional to 13,405.60, 20,109.60 and 5,612.80

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Solution

The fourth proportional to 13,405.60, 20,109.60 and 5,612.80 is: 8,419.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,405.60 : 20,109.60 = 5,612.80 : x
  2. Step 2: Convert to fraction form
    13,405.60/20,109.60 = 5,612.80/x
  3. Step 3: Cross multiply
    13,405.60x = 20,109.60 × 5,612.80
  4. Step 4: Simplify right side
    13,405.60x = 112,871,162.88
  5. Step 5: Solve for x
    x = 112,871,162.88/13,405.60
  6. Step 6: Final answer
    x = 8,419.70

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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.