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Finding the Fourth Proportional to 258.86, 357.31 and 170.40

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Solution

The fourth proportional to 258.86, 357.31 and 170.40 is: 235.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.86 : 357.31 = 170.40 : x
  2. Step 2: Convert to fraction form
    258.86/357.31 = 170.40/x
  3. Step 3: Cross multiply
    258.86x = 357.31 × 170.40
  4. Step 4: Simplify right side
    258.86x = 60,887.18
  5. Step 5: Solve for x
    x = 60,887.18/258.86
  6. Step 6: Final answer
    x = 235.21

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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.