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Finding the Fourth Proportional to 178.89, 246.90 and 105.21

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Solution

The fourth proportional to 178.89, 246.90 and 105.21 is: 145.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.89 : 246.90 = 105.21 : x
  2. Step 2: Convert to fraction form
    178.89/246.90 = 105.21/x
  3. Step 3: Cross multiply
    178.89x = 246.90 × 105.21
  4. Step 4: Simplify right side
    178.89x = 25,975.99
  5. Step 5: Solve for x
    x = 25,975.99/178.89
  6. Step 6: Final answer
    x = 145.21

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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.