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Finding the Fourth Proportional to 258.30, 356.40 and 147.74

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Solution

The fourth proportional to 258.30, 356.40 and 147.74 is: 203.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.30 : 356.40 = 147.74 : x
  2. Step 2: Convert to fraction form
    258.30/356.40 = 147.74/x
  3. Step 3: Cross multiply
    258.30x = 356.40 × 147.74
  4. Step 4: Simplify right side
    258.30x = 52,654.54
  5. Step 5: Solve for x
    x = 52,654.54/258.30
  6. Step 6: Final answer
    x = 203.85

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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.