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Finding the Fourth Proportional to 12,142.76, 18,201.18 and 8,669.48

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Solution

The fourth proportional to 12,142.76, 18,201.18 and 8,669.48 is: 12,994.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,142.76 : 18,201.18 = 8,669.48 : x
  2. Step 2: Convert to fraction form
    12,142.76/18,201.18 = 8,669.48/x
  3. Step 3: Cross multiply
    12,142.76x = 18,201.18 × 8,669.48
  4. Step 4: Simplify right side
    12,142.76x = 157,794,765.99
  5. Step 5: Solve for x
    x = 157,794,765.99/12,142.76
  6. Step 6: Final answer
    x = 12,994.97

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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.