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Finding the Fourth Proportional to 13,613.41, 18,788.21 and 8,308.45

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Solution

The fourth proportional to 13,613.41, 18,788.21 and 8,308.45 is: 11,466.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,613.41 : 18,788.21 = 8,308.45 : x
  2. Step 2: Convert to fraction form
    13,613.41/18,788.21 = 8,308.45/x
  3. Step 3: Cross multiply
    13,613.41x = 18,788.21 × 8,308.45
  4. Step 4: Simplify right side
    13,613.41x = 156,100,861.83
  5. Step 5: Solve for x
    x = 156,100,861.83/13,613.41
  6. Step 6: Final answer
    x = 11,466.70

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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.