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Finding the Fourth Proportional to 170.72, 235.68 and 137.92

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Solution

The fourth proportional to 170.72, 235.68 and 137.92 is: 190.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.72 : 235.68 = 137.92 : x
  2. Step 2: Convert to fraction form
    170.72/235.68 = 137.92/x
  3. Step 3: Cross multiply
    170.72x = 235.68 × 137.92
  4. Step 4: Simplify right side
    170.72x = 32,504.99
  5. Step 5: Solve for x
    x = 32,504.99/170.72
  6. Step 6: Final answer
    x = 190.40

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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.