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Finding the Fourth Proportional to 305.65, 421.76 and 179.59

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Solution

The fourth proportional to 305.65, 421.76 and 179.59 is: 247.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.65 : 421.76 = 179.59 : x
  2. Step 2: Convert to fraction form
    305.65/421.76 = 179.59/x
  3. Step 3: Cross multiply
    305.65x = 421.76 × 179.59
  4. Step 4: Simplify right side
    305.65x = 75,743.88
  5. Step 5: Solve for x
    x = 75,743.88/305.65
  6. Step 6: Final answer
    x = 247.81

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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.