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Finding the Fourth Proportional to 258.19, 356.40 and 171.11

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Solution

The fourth proportional to 258.19, 356.40 and 171.11 is: 236.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.19 : 356.40 = 171.11 : x
  2. Step 2: Convert to fraction form
    258.19/356.40 = 171.11/x
  3. Step 3: Cross multiply
    258.19x = 356.40 × 171.11
  4. Step 4: Simplify right side
    258.19x = 60,984.50
  5. Step 5: Solve for x
    x = 60,984.50/258.19
  6. Step 6: Final answer
    x = 236.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.