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Finding the Fourth Proportional to 171.51, 257.39 and 90.37

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Solution

The fourth proportional to 171.51, 257.39 and 90.37 is: 135.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.51 : 257.39 = 90.37 : x
  2. Step 2: Convert to fraction form
    171.51/257.39 = 90.37/x
  3. Step 3: Cross multiply
    171.51x = 257.39 × 90.37
  4. Step 4: Simplify right side
    171.51x = 23,260.33
  5. Step 5: Solve for x
    x = 23,260.33/171.51
  6. Step 6: Final answer
    x = 135.62

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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.