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Finding the Fourth Proportional to 203,576.80, 305,219.40 and 85,187.20

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Solution

The fourth proportional to 203,576.80, 305,219.40 and 85,187.20 is: 127,719.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,576.80 : 305,219.40 = 85,187.20 : x
  2. Step 2: Convert to fraction form
    203,576.80/305,219.40 = 85,187.20/x
  3. Step 3: Cross multiply
    203,576.80x = 305,219.40 × 85,187.20
  4. Step 4: Simplify right side
    203,576.80x = 26,000,786,071.68
  5. Step 5: Solve for x
    x = 26,000,786,071.68/203,576.80
  6. Step 6: Final answer
    x = 127,719.79

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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.