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Finding the Fourth Proportional to 611.78, 917.65 and 200.75

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Solution

The fourth proportional to 611.78, 917.65 and 200.75 is: 301.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.78 : 917.65 = 200.75 : x
  2. Step 2: Convert to fraction form
    611.78/917.65 = 200.75/x
  3. Step 3: Cross multiply
    611.78x = 917.65 × 200.75
  4. Step 4: Simplify right side
    611.78x = 184,213.90
  5. Step 5: Solve for x
    x = 184,213.90/611.78
  6. Step 6: Final answer
    x = 301.11

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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.