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Finding the Fourth Proportional to 200.58, 300.78 and 109.20

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Solution

The fourth proportional to 200.58, 300.78 and 109.20 is: 163.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.58 : 300.78 = 109.20 : x
  2. Step 2: Convert to fraction form
    200.58/300.78 = 109.20/x
  3. Step 3: Cross multiply
    200.58x = 300.78 × 109.20
  4. Step 4: Simplify right side
    200.58x = 32,845.18
  5. Step 5: Solve for x
    x = 32,845.18/200.58
  6. Step 6: Final answer
    x = 163.75

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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.