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Finding the Fourth Proportional to 135,221.80, 202,999.10 and 85,301.80

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Solution

The fourth proportional to 135,221.80, 202,999.10 and 85,301.80 is: 128,057.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,221.80 : 202,999.10 = 85,301.80 : x
  2. Step 2: Convert to fraction form
    135,221.80/202,999.10 = 85,301.80/x
  3. Step 3: Cross multiply
    135,221.80x = 202,999.10 × 85,301.80
  4. Step 4: Simplify right side
    135,221.80x = 17,316,188,628.38
  5. Step 5: Solve for x
    x = 17,316,188,628.38/135,221.80
  6. Step 6: Final answer
    x = 128,057.67

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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.