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Finding the Fourth Proportional to 13,680.90, 18,867.04 and 8,636.40

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Solution

The fourth proportional to 13,680.90, 18,867.04 and 8,636.40 is: 11,910.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680.90 : 18,867.04 = 8,636.40 : x
  2. Step 2: Convert to fraction form
    13,680.90/18,867.04 = 8,636.40/x
  3. Step 3: Cross multiply
    13,680.90x = 18,867.04 × 8,636.40
  4. Step 4: Simplify right side
    13,680.90x = 162,943,304.26
  5. Step 5: Solve for x
    x = 162,943,304.26/13,680.90
  6. Step 6: Final answer
    x = 11,910.28

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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.