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Finding the Fourth Proportional to 12,487.60, 17,212.85 and 8,453.16

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Solution

The fourth proportional to 12,487.60, 17,212.85 and 8,453.16 is: 11,651.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.60 : 17,212.85 = 8,453.16 : x
  2. Step 2: Convert to fraction form
    12,487.60/17,212.85 = 8,453.16/x
  3. Step 3: Cross multiply
    12,487.60x = 17,212.85 × 8,453.16
  4. Step 4: Simplify right side
    12,487.60x = 145,503,012.09
  5. Step 5: Solve for x
    x = 145,503,012.09/12,487.60
  6. Step 6: Final answer
    x = 11,651.80

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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.