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Finding the Fourth Proportional to 178.40, 246.27 and 131.78

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Solution

The fourth proportional to 178.40, 246.27 and 131.78 is: 181.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.40 : 246.27 = 131.78 : x
  2. Step 2: Convert to fraction form
    178.40/246.27 = 131.78/x
  3. Step 3: Cross multiply
    178.40x = 246.27 × 131.78
  4. Step 4: Simplify right side
    178.40x = 32,453.46
  5. Step 5: Solve for x
    x = 32,453.46/178.40
  6. Step 6: Final answer
    x = 181.91

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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.