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Finding the Fourth Proportional to 258.51, 357.21 and 196.23

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Solution

The fourth proportional to 258.51, 357.21 and 196.23 is: 271.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.51 : 357.21 = 196.23 : x
  2. Step 2: Convert to fraction form
    258.51/357.21 = 196.23/x
  3. Step 3: Cross multiply
    258.51x = 357.21 × 196.23
  4. Step 4: Simplify right side
    258.51x = 70,095.32
  5. Step 5: Solve for x
    x = 70,095.32/258.51
  6. Step 6: Final answer
    x = 271.15

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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.