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Finding the Fourth Proportional to 171.47, 257.21 and 90.33

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Solution

The fourth proportional to 171.47, 257.21 and 90.33 is: 135.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.47 : 257.21 = 90.33 : x
  2. Step 2: Convert to fraction form
    171.47/257.21 = 90.33/x
  3. Step 3: Cross multiply
    171.47x = 257.21 × 90.33
  4. Step 4: Simplify right side
    171.47x = 23,233.78
  5. Step 5: Solve for x
    x = 23,233.78/171.47
  6. Step 6: Final answer
    x = 135.50

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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.