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Finding the Fourth Proportional to 200.31, 300.39 and 76.87

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Solution

The fourth proportional to 200.31, 300.39 and 76.87 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.31 : 300.39 = 76.87 : x
  2. Step 2: Convert to fraction form
    200.31/300.39 = 76.87/x
  3. Step 3: Cross multiply
    200.31x = 300.39 × 76.87
  4. Step 4: Simplify right side
    200.31x = 23,090.98
  5. Step 5: Solve for x
    x = 23,090.98/200.31
  6. Step 6: Final answer
    x = 115.28

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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.