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Finding the Fourth Proportional to 258.02, 386.86 and 171.38

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Solution

The fourth proportional to 258.02, 386.86 and 171.38 is: 256.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.02 : 386.86 = 171.38 : x
  2. Step 2: Convert to fraction form
    258.02/386.86 = 171.38/x
  3. Step 3: Cross multiply
    258.02x = 386.86 × 171.38
  4. Step 4: Simplify right side
    258.02x = 66,300.07
  5. Step 5: Solve for x
    x = 66,300.07/258.02
  6. Step 6: Final answer
    x = 256.96

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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.