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Finding the Fourth Proportional to 200.54, 300.85 and 78.81

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Solution

The fourth proportional to 200.54, 300.85 and 78.81 is: 118.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.54 : 300.85 = 78.81 : x
  2. Step 2: Convert to fraction form
    200.54/300.85 = 78.81/x
  3. Step 3: Cross multiply
    200.54x = 300.85 × 78.81
  4. Step 4: Simplify right side
    200.54x = 23,708.66
  5. Step 5: Solve for x
    x = 23,708.66/200.54
  6. Step 6: Final answer
    x = 118.22

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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.