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Finding the Fourth Proportional to 258.30, 356.45 and 147.77

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Solution

The fourth proportional to 258.30, 356.45 and 147.77 is: 203.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.30 : 356.45 = 147.77 : x
  2. Step 2: Convert to fraction form
    258.30/356.45 = 147.77/x
  3. Step 3: Cross multiply
    258.30x = 356.45 × 147.77
  4. Step 4: Simplify right side
    258.30x = 52,672.62
  5. Step 5: Solve for x
    x = 52,672.62/258.30
  6. Step 6: Final answer
    x = 203.92

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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.