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Finding the Fourth Proportional to 201.61, 278.25 and 118.75

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Solution

The fourth proportional to 201.61, 278.25 and 118.75 is: 163.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.61 : 278.25 = 118.75 : x
  2. Step 2: Convert to fraction form
    201.61/278.25 = 118.75/x
  3. Step 3: Cross multiply
    201.61x = 278.25 × 118.75
  4. Step 4: Simplify right side
    201.61x = 33,042.19
  5. Step 5: Solve for x
    x = 33,042.19/201.61
  6. Step 6: Final answer
    x = 163.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.