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Finding the Fourth Proportional to 107,997.80, 161,996.70 and 81,386.60

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Solution

The fourth proportional to 107,997.80, 161,996.70 and 81,386.60 is: 122,079.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,997.80 : 161,996.70 = 81,386.60 : x
  2. Step 2: Convert to fraction form
    107,997.80/161,996.70 = 81,386.60/x
  3. Step 3: Cross multiply
    107,997.80x = 161,996.70 × 81,386.60
  4. Step 4: Simplify right side
    107,997.80x = 13,184,360,624.22
  5. Step 5: Solve for x
    x = 13,184,360,624.22/107,997.80
  6. Step 6: Final answer
    x = 122,079.90

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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.