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Finding the Fourth Proportional to 30,391.80, 41,936.50 and 16,961.79

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Solution

The fourth proportional to 30,391.80, 41,936.50 and 16,961.79 is: 23,404.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,391.80 : 41,936.50 = 16,961.79 : x
  2. Step 2: Convert to fraction form
    30,391.80/41,936.50 = 16,961.79/x
  3. Step 3: Cross multiply
    30,391.80x = 41,936.50 × 16,961.79
  4. Step 4: Simplify right side
    30,391.80x = 711,318,106.34
  5. Step 5: Solve for x
    x = 711,318,106.34/30,391.80
  6. Step 6: Final answer
    x = 23,404.94

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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.