Home / 131,490.20-197,235.30-81,407.90

Finding the Fourth Proportional to 131,490.20, 197,235.30 and 81,407.90

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Solution

The fourth proportional to 131,490.20, 197,235.30 and 81,407.90 is: 122,111.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,490.20 : 197,235.30 = 81,407.90 : x
  2. Step 2: Convert to fraction form
    131,490.20/197,235.30 = 81,407.90/x
  3. Step 3: Cross multiply
    131,490.20x = 197,235.30 × 81,407.90
  4. Step 4: Simplify right side
    131,490.20x = 16,056,511,578.87
  5. Step 5: Solve for x
    x = 16,056,511,578.87/131,490.20
  6. Step 6: Final answer
    x = 122,111.85

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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.