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Finding the Fourth Proportional to 206,405.16, 309,745.82 and 75,077.16

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Solution

The fourth proportional to 206,405.16, 309,745.82 and 75,077.16 is: 112,665.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,405.16 : 309,745.82 = 75,077.16 : x
  2. Step 2: Convert to fraction form
    206,405.16/309,745.82 = 75,077.16/x
  3. Step 3: Cross multiply
    206,405.16x = 309,745.82 × 75,077.16
  4. Step 4: Simplify right side
    206,405.16x = 23,254,836,487.47
  5. Step 5: Solve for x
    x = 23,254,836,487.47/206,405.16
  6. Step 6: Final answer
    x = 112,665.96

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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.