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Finding the Fourth Proportional to 258.63, 356.91 and 142.20

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Solution

The fourth proportional to 258.63, 356.91 and 142.20 is: 196.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.63 : 356.91 = 142.20 : x
  2. Step 2: Convert to fraction form
    258.63/356.91 = 142.20/x
  3. Step 3: Cross multiply
    258.63x = 356.91 × 142.20
  4. Step 4: Simplify right side
    258.63x = 50,752.60
  5. Step 5: Solve for x
    x = 50,752.60/258.63
  6. Step 6: Final answer
    x = 196.24

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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.