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Finding the Fourth Proportional to 171.31, 257.00 and 90.13

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Solution

The fourth proportional to 171.31, 257.00 and 90.13 is: 135.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.31 : 257.00 = 90.13 : x
  2. Step 2: Convert to fraction form
    171.31/257.00 = 90.13/x
  3. Step 3: Cross multiply
    171.31x = 257.00 × 90.13
  4. Step 4: Simplify right side
    171.31x = 23,162.35
  5. Step 5: Solve for x
    x = 23,162.35/171.31
  6. Step 6: Final answer
    x = 135.21

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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.