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Finding the Fourth Proportional to 13,615.80, 18,786.46 and 8,308.68

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Solution

The fourth proportional to 13,615.80, 18,786.46 and 8,308.68 is: 11,463.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.80 : 18,786.46 = 8,308.68 : x
  2. Step 2: Convert to fraction form
    13,615.80/18,786.46 = 8,308.68/x
  3. Step 3: Cross multiply
    13,615.80x = 18,786.46 × 8,308.68
  4. Step 4: Simplify right side
    13,615.80x = 156,090,684.47
  5. Step 5: Solve for x
    x = 156,090,684.47/13,615.80
  6. Step 6: Final answer
    x = 11,463.94

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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.