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Finding the Fourth Proportional to 171.54, 257.40 and 90.36

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Solution

The fourth proportional to 171.54, 257.40 and 90.36 is: 135.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.54 : 257.40 = 90.36 : x
  2. Step 2: Convert to fraction form
    171.54/257.40 = 90.36/x
  3. Step 3: Cross multiply
    171.54x = 257.40 × 90.36
  4. Step 4: Simplify right side
    171.54x = 23,258.66
  5. Step 5: Solve for x
    x = 23,258.66/171.54
  6. Step 6: Final answer
    x = 135.59

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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.