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Finding the Fourth Proportional to 258.20, 356.31 and 141.76

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Solution

The fourth proportional to 258.20, 356.31 and 141.76 is: 195.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.20 : 356.31 = 141.76 : x
  2. Step 2: Convert to fraction form
    258.20/356.31 = 141.76/x
  3. Step 3: Cross multiply
    258.20x = 356.31 × 141.76
  4. Step 4: Simplify right side
    258.20x = 50,510.51
  5. Step 5: Solve for x
    x = 50,510.51/258.20
  6. Step 6: Final answer
    x = 195.63

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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.