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Finding the Fourth Proportional to 174.21, 239.94 and 137.28

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Solution

The fourth proportional to 174.21, 239.94 and 137.28 is: 189.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.21 : 239.94 = 137.28 : x
  2. Step 2: Convert to fraction form
    174.21/239.94 = 137.28/x
  3. Step 3: Cross multiply
    174.21x = 239.94 × 137.28
  4. Step 4: Simplify right side
    174.21x = 32,938.96
  5. Step 5: Solve for x
    x = 32,938.96/174.21
  6. Step 6: Final answer
    x = 189.08

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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.