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Finding the Fourth Proportional to 203,437.78, 305,156.65 and 68,490.56

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Solution

The fourth proportional to 203,437.78, 305,156.65 and 68,490.56 is: 102,735.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,437.78 : 305,156.65 = 68,490.56 : x
  2. Step 2: Convert to fraction form
    203,437.78/305,156.65 = 68,490.56/x
  3. Step 3: Cross multiply
    203,437.78x = 305,156.65 × 68,490.56
  4. Step 4: Simplify right side
    203,437.78x = 20,900,350,017.45
  5. Step 5: Solve for x
    x = 20,900,350,017.45/203,437.78
  6. Step 6: Final answer
    x = 102,735.84

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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.