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Finding the Fourth Proportional to 13,685.59, 18,889.67 and 8,918.60

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Solution

The fourth proportional to 13,685.59, 18,889.67 and 8,918.60 is: 12,309.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,685.59 : 18,889.67 = 8,918.60 : x
  2. Step 2: Convert to fraction form
    13,685.59/18,889.67 = 8,918.60/x
  3. Step 3: Cross multiply
    13,685.59x = 18,889.67 × 8,918.60
  4. Step 4: Simplify right side
    13,685.59x = 168,469,366.27
  5. Step 5: Solve for x
    x = 168,469,366.27/13,685.59
  6. Step 6: Final answer
    x = 12,309.99

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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.