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Finding the Fourth Proportional to 13,188.60, 19,785.60 and 4,429.80

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Solution

The fourth proportional to 13,188.60, 19,785.60 and 4,429.80 is: 6,645.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,188.60 : 19,785.60 = 4,429.80 : x
  2. Step 2: Convert to fraction form
    13,188.60/19,785.60 = 4,429.80/x
  3. Step 3: Cross multiply
    13,188.60x = 19,785.60 × 4,429.80
  4. Step 4: Simplify right side
    13,188.60x = 87,646,250.88
  5. Step 5: Solve for x
    x = 87,646,250.88/13,188.60
  6. Step 6: Final answer
    x = 6,645.61

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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.