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Finding the Fourth Proportional to 13,706.55, 18,914.72 and 8,117.55

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Solution

The fourth proportional to 13,706.55, 18,914.72 and 8,117.55 is: 11,202.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,706.55 : 18,914.72 = 8,117.55 : x
  2. Step 2: Convert to fraction form
    13,706.55/18,914.72 = 8,117.55/x
  3. Step 3: Cross multiply
    13,706.55x = 18,914.72 × 8,117.55
  4. Step 4: Simplify right side
    13,706.55x = 153,541,144.75
  5. Step 5: Solve for x
    x = 153,541,144.75/13,706.55
  6. Step 6: Final answer
    x = 11,202.03

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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.