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Finding the Fourth Proportional to 109,997.80, 164,996.70 and 76,820.20

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Solution

The fourth proportional to 109,997.80, 164,996.70 and 76,820.20 is: 115,230.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,997.80 : 164,996.70 = 76,820.20 : x
  2. Step 2: Convert to fraction form
    109,997.80/164,996.70 = 76,820.20/x
  3. Step 3: Cross multiply
    109,997.80x = 164,996.70 × 76,820.20
  4. Step 4: Simplify right side
    109,997.80x = 12,675,079,493.34
  5. Step 5: Solve for x
    x = 12,675,079,493.34/109,997.80
  6. Step 6: Final answer
    x = 115,230.30

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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.