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Finding the Fourth Proportional to 18,609.78, 27,915.87 and 8,221.50

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Solution

The fourth proportional to 18,609.78, 27,915.87 and 8,221.50 is: 12,332.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,609.78 : 27,915.87 = 8,221.50 : x
  2. Step 2: Convert to fraction form
    18,609.78/27,915.87 = 8,221.50/x
  3. Step 3: Cross multiply
    18,609.78x = 27,915.87 × 8,221.50
  4. Step 4: Simplify right side
    18,609.78x = 229,510,325.21
  5. Step 5: Solve for x
    x = 229,510,325.21/18,609.78
  6. Step 6: Final answer
    x = 12,332.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.