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Finding the Fourth Proportional to 201.72, 302.40 and 105.42

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Solution

The fourth proportional to 201.72, 302.40 and 105.42 is: 158.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.72 : 302.40 = 105.42 : x
  2. Step 2: Convert to fraction form
    201.72/302.40 = 105.42/x
  3. Step 3: Cross multiply
    201.72x = 302.40 × 105.42
  4. Step 4: Simplify right side
    201.72x = 31,879.01
  5. Step 5: Solve for x
    x = 31,879.01/201.72
  6. Step 6: Final answer
    x = 158.04

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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.