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Finding the Fourth Proportional to 18,438.57, 27,646.11 and 8,580.87

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Solution

The fourth proportional to 18,438.57, 27,646.11 and 8,580.87 is: 12,865.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,438.57 : 27,646.11 = 8,580.87 : x
  2. Step 2: Convert to fraction form
    18,438.57/27,646.11 = 8,580.87/x
  3. Step 3: Cross multiply
    18,438.57x = 27,646.11 × 8,580.87
  4. Step 4: Simplify right side
    18,438.57x = 237,227,675.92
  5. Step 5: Solve for x
    x = 237,227,675.92/18,438.57
  6. Step 6: Final answer
    x = 12,865.84

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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.