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Finding the Fourth Proportional to 178.56, 246.24 and 123.20

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Solution

The fourth proportional to 178.56, 246.24 and 123.20 is: 169.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.56 : 246.24 = 123.20 : x
  2. Step 2: Convert to fraction form
    178.56/246.24 = 123.20/x
  3. Step 3: Cross multiply
    178.56x = 246.24 × 123.20
  4. Step 4: Simplify right side
    178.56x = 30,336.77
  5. Step 5: Solve for x
    x = 30,336.77/178.56
  6. Step 6: Final answer
    x = 169.90

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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.