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Finding the Fourth Proportional to 103,961.80, 155,712.30 and 80,512.20

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Solution

The fourth proportional to 103,961.80, 155,712.30 and 80,512.20 is: 120,589.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,961.80 : 155,712.30 = 80,512.20 : x
  2. Step 2: Convert to fraction form
    103,961.80/155,712.30 = 80,512.20/x
  3. Step 3: Cross multiply
    103,961.80x = 155,712.30 × 80,512.20
  4. Step 4: Simplify right side
    103,961.80x = 12,536,739,840.06
  5. Step 5: Solve for x
    x = 12,536,739,840.06/103,961.80
  6. Step 6: Final answer
    x = 120,589.87

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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.