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Finding the Fourth Proportional to 13,608.60, 18,781.92 and 8,306.49

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Solution

The fourth proportional to 13,608.60, 18,781.92 and 8,306.49 is: 11,464.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,608.60 : 18,781.92 = 8,306.49 : x
  2. Step 2: Convert to fraction form
    13,608.60/18,781.92 = 8,306.49/x
  3. Step 3: Cross multiply
    13,608.60x = 18,781.92 × 8,306.49
  4. Step 4: Simplify right side
    13,608.60x = 156,011,830.66
  5. Step 5: Solve for x
    x = 156,011,830.66/13,608.60
  6. Step 6: Final answer
    x = 11,464.21

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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.