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Finding the Fourth Proportional to 408,450.88, 612,676.59 and 127,990

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Solution

The fourth proportional to 408,450.88, 612,676.59 and 127,990 is: 191,985.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,450.88 : 612,676.59 = 127,990 : x
  2. Step 2: Convert to fraction form
    408,450.88/612,676.59 = 127,990/x
  3. Step 3: Cross multiply
    408,450.88x = 612,676.59 × 127,990
  4. Step 4: Simplify right side
    408,450.88x = 78,416,476,754.10
  5. Step 5: Solve for x
    x = 78,416,476,754.10/408,450.88
  6. Step 6: Final answer
    x = 191,985.08

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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.