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Finding the Fourth Proportional to 15,189.60, 20,958 and 8,899.68

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Solution

The fourth proportional to 15,189.60, 20,958 and 8,899.68 is: 12,279.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,189.60 : 20,958 = 8,899.68 : x
  2. Step 2: Convert to fraction form
    15,189.60/20,958 = 8,899.68/x
  3. Step 3: Cross multiply
    15,189.60x = 20,958 × 8,899.68
  4. Step 4: Simplify right side
    15,189.60x = 186,519,493.44
  5. Step 5: Solve for x
    x = 186,519,493.44/15,189.60
  6. Step 6: Final answer
    x = 12,279.42

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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.