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Finding the Fourth Proportional to 11,912.92, 16,420.89 and 9,390.94

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Solution

The fourth proportional to 11,912.92, 16,420.89 and 9,390.94 is: 12,944.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,912.92 : 16,420.89 = 9,390.94 : x
  2. Step 2: Convert to fraction form
    11,912.92/16,420.89 = 9,390.94/x
  3. Step 3: Cross multiply
    11,912.92x = 16,420.89 × 9,390.94
  4. Step 4: Simplify right side
    11,912.92x = 154,207,592.74
  5. Step 5: Solve for x
    x = 154,207,592.74/11,912.92
  6. Step 6: Final answer
    x = 12,944.57

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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.