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Finding the Fourth Proportional to 13,169.80, 18,165.42 and 8,459.80

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Solution

The fourth proportional to 13,169.80, 18,165.42 and 8,459.80 is: 11,668.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,169.80 : 18,165.42 = 8,459.80 : x
  2. Step 2: Convert to fraction form
    13,169.80/18,165.42 = 8,459.80/x
  3. Step 3: Cross multiply
    13,169.80x = 18,165.42 × 8,459.80
  4. Step 4: Simplify right side
    13,169.80x = 153,675,820.12
  5. Step 5: Solve for x
    x = 153,675,820.12/13,169.80
  6. Step 6: Final answer
    x = 11,668.80

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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.