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Finding the Fourth Proportional to 155.21, 230.79 and 148.73

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Solution

The fourth proportional to 155.21, 230.79 and 148.73 is: 221.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.21 : 230.79 = 148.73 : x
  2. Step 2: Convert to fraction form
    155.21/230.79 = 148.73/x
  3. Step 3: Cross multiply
    155.21x = 230.79 × 148.73
  4. Step 4: Simplify right side
    155.21x = 34,324.65
  5. Step 5: Solve for x
    x = 34,324.65/155.21
  6. Step 6: Final answer
    x = 221.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.