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Finding the Fourth Proportional to 13,221.60, 18,246.20 and 7,919.32

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Solution

The fourth proportional to 13,221.60, 18,246.20 and 7,919.32 is: 10,928.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221.60 : 18,246.20 = 7,919.32 : x
  2. Step 2: Convert to fraction form
    13,221.60/18,246.20 = 7,919.32/x
  3. Step 3: Cross multiply
    13,221.60x = 18,246.20 × 7,919.32
  4. Step 4: Simplify right side
    13,221.60x = 144,497,496.58
  5. Step 5: Solve for x
    x = 144,497,496.58/13,221.60
  6. Step 6: Final answer
    x = 10,928.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.