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Finding the Fourth Proportional to 408,369.88, 612,554.82 and 127,909

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Solution

The fourth proportional to 408,369.88, 612,554.82 and 127,909 is: 191,863.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,369.88 : 612,554.82 = 127,909 : x
  2. Step 2: Convert to fraction form
    408,369.88/612,554.82 = 127,909/x
  3. Step 3: Cross multiply
    408,369.88x = 612,554.82 × 127,909
  4. Step 4: Simplify right side
    408,369.88x = 78,351,274,471.38
  5. Step 5: Solve for x
    x = 78,351,274,471.38/408,369.88
  6. Step 6: Final answer
    x = 191,863.50

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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.