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Finding the Fourth Proportional to 13,609.89, 18,784.71 and 8,891.46

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Solution

The fourth proportional to 13,609.89, 18,784.71 and 8,891.46 is: 12,272.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.89 : 18,784.71 = 8,891.46 : x
  2. Step 2: Convert to fraction form
    13,609.89/18,784.71 = 8,891.46/x
  3. Step 3: Cross multiply
    13,609.89x = 18,784.71 × 8,891.46
  4. Step 4: Simplify right side
    13,609.89x = 167,023,497.58
  5. Step 5: Solve for x
    x = 167,023,497.58/13,609.89
  6. Step 6: Final answer
    x = 12,272.22

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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.