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Finding the Fourth Proportional to 10,921.80, 16,365.90 and 8,135.40

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Solution

The fourth proportional to 10,921.80, 16,365.90 and 8,135.40 is: 12,190.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,921.80 : 16,365.90 = 8,135.40 : x
  2. Step 2: Convert to fraction form
    10,921.80/16,365.90 = 8,135.40/x
  3. Step 3: Cross multiply
    10,921.80x = 16,365.90 × 8,135.40
  4. Step 4: Simplify right side
    10,921.80x = 133,143,142.86
  5. Step 5: Solve for x
    x = 133,143,142.86/10,921.80
  6. Step 6: Final answer
    x = 12,190.59

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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.