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Finding the Fourth Proportional to 201.78, 301.39 and 161.08

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Solution

The fourth proportional to 201.78, 301.39 and 161.08 is: 240.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.78 : 301.39 = 161.08 : x
  2. Step 2: Convert to fraction form
    201.78/301.39 = 161.08/x
  3. Step 3: Cross multiply
    201.78x = 301.39 × 161.08
  4. Step 4: Simplify right side
    201.78x = 48,547.90
  5. Step 5: Solve for x
    x = 48,547.90/201.78
  6. Step 6: Final answer
    x = 240.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.