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Finding the Fourth Proportional to 171.51, 257.15 and 90.41

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Solution

The fourth proportional to 171.51, 257.15 and 90.41 is: 135.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.51 : 257.15 = 90.41 : x
  2. Step 2: Convert to fraction form
    171.51/257.15 = 90.41/x
  3. Step 3: Cross multiply
    171.51x = 257.15 × 90.41
  4. Step 4: Simplify right side
    171.51x = 23,247.19
  5. Step 5: Solve for x
    x = 23,247.19/171.51
  6. Step 6: Final answer
    x = 135.54

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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.