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Finding the Fourth Proportional to 13,489.59, 18,612.54 and 8,109.57

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Solution

The fourth proportional to 13,489.59, 18,612.54 and 8,109.57 is: 11,189.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,489.59 : 18,612.54 = 8,109.57 : x
  2. Step 2: Convert to fraction form
    13,489.59/18,612.54 = 8,109.57/x
  3. Step 3: Cross multiply
    13,489.59x = 18,612.54 × 8,109.57
  4. Step 4: Simplify right side
    13,489.59x = 150,939,696.01
  5. Step 5: Solve for x
    x = 150,939,696.01/13,489.59
  6. Step 6: Final answer
    x = 11,189.35

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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.