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Finding the Fourth Proportional to 201.72, 302.78 and 118.36

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Solution

The fourth proportional to 201.72, 302.78 and 118.36 is: 177.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.72 : 302.78 = 118.36 : x
  2. Step 2: Convert to fraction form
    201.72/302.78 = 118.36/x
  3. Step 3: Cross multiply
    201.72x = 302.78 × 118.36
  4. Step 4: Simplify right side
    201.72x = 35,837.04
  5. Step 5: Solve for x
    x = 35,837.04/201.72
  6. Step 6: Final answer
    x = 177.66

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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.